# Patent

## Title
System and method for describing application extensions in XML

## Abstract

A system and method for an extendable application framework, comprising a user interface, at least one service, at least one extension, wherein one of the at least one extensions can provide access to functionality in the user interface, and wherein one of the at least one services can provide access to functionality in one of the at least one extensions.

## Background
CLAIM OF PRIORITY
This application claims priority from the following application, which is hereby incorporated by reference in its entirety:
EXTENSIBLE INTERACTIVE SOFTWARE DEVELOPMENT ENVIRONMENT, U.S. Application No. 60/451,340, Inventors: Ross Bunker et al., filed on Feb. 28, 2003.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is related to the following co-pending applications which are each hereby incorporated by reference in their entirety:
SYSTEM AND METHOD FOR MULTI-LANGUAGE EXTENSIBLE COMPILER FRAMEWORK, U.S. application Ser. No. 10/782,715, Inventors: Kevin Zatloukal, filed on Feb. 19, 2004.
SYSTEMS AND METHODS FOR MULTI-LANGUAGE DEBUGGING, U.S. Application No. 60/450,014, Inventors: William Pugh et al., filed on Feb. 26, 2003.
SYSTEMS AND METHODS FOR MULTI-VIEW DEBUGGING ENVIRONMENT, U.S. Application No. 60/451,368, Inventors: Josh Eckels et al., filed on Mar. 1, 2003.
SYSTEMS AND METHODS FOR TYPE-INDEPENDENCE SOURCE CODE EDITING, U.S. Application No. 60/449,984, Inventors: Britt Piehler et al., filed on Feb. 26, 2003.
MULTI-THREADED MULTI-LANGUAGE COMPILER FRAMEWORK, U.S. Application No. 60/488,629, Inventors: Kevin Zatloukal, filed on Jul. 19, 2003.
EXTENDABLE COMPILER FRAMEWORK, U.S. application Ser. No. 10/951,315, Inventors: Kevin Zatloukal, filed on Sep. 27, 2004.


COPYRIGHT NOTICE
A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever.
FIELD OF THE DISCLOSURE
The present invention disclosure relates to an extensible interactive development environment.
BACKGROUND
Typical interactive applications provide for operating on a fixed set of file types where the file contains a single type of content. Increasingly, applications require the use of files that contain many different kinds of interleaved content or code in different programming languages. Moreover, the frequency with which new types of content and programming languages become available is increasing rapidly. These factors require a new kind of interactive application that can be dynamically configured.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exemplary illustration of an interactive application extension component in an embodiment.
FIG. 2 is an exemplary illustration of a generic interactive application in an embodiment.
FIG. 3 is an exemplary illustration of services in an embodiment.



DETAILED DESCRIPTION
The invention is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It can be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one.
In one embodiment, a generic interactive application (GIA) can be dynamically configured and functionally extended by defining it in terms of interchangeable building blocks called extensions. By way of a non-limiting example, extensions can provide new graphical user interface (GUI) components, new project/file types, and new application functionality. An example of a GIA is WebLogic® Workshop, an interactive software development environment available from BEA Systems, Inc. of San Jose, Calif.
FIG. 1 is an exemplary illustration of an interactive application extension component in an embodiment. In one embodiment, an extension can include an XML (Extensible Markup Language) descriptor 100 (“extension.xml”), an optional set of classes defined in an object-oriented programming language (e.g., JavaTM, C#, C++, or another suitable language) 102 that can expose interfaces and consume services, and optional resources 104 (e.g., images, text strings, sounds, and any other suitable resource). An extension's components can be packaged together in an archive as a file (e.g., a JAR JavaTM Archive), a directory or any combination thereof. For complex extensions, a JAR file can contain the code that is the extension's implementation, a manifest file which defines the class path, and attributes that reference dependent JARs that need to be available at run time by the extension.
FIG. 2 is an exemplary illustration a generic interactive application in an embodiment. Although this diagram depicts components as logically separate, such depiction is merely for illustrative purposes. It will be apparent to those skilled in the art that the components portrayed in this figure can be arbitrarily combined or divided into separate software, firmware and/or hardware. Furthermore, it will also be apparent to those skilled in the art that such components, regardless of how they are combined or divided, can execute on the same computing device or can be distributed among different computing devices connected by one or more networks or other suitable communication means.
In one embodiment, a GIA 204 includes a user interface (UI) 200 and a set of services 206. The GIA and its services can make use of and extend the functionality of, the UI. By way of a non-limiting example, the UI can include one or more of the following: 1) a graphical user interface (GUI) (e.g., rendered with Hypertext Markup Language); 2) an ability to respond to sounds and/or voice commands; 3) an ability to respond to input from a remote control device (e.g., a cellular telephone, a PDA, or other suitable remote control); 4) an ability to respond to gestures (e.g., facial and otherwise); 5) an ability to respond to commands from a process on the same or another computing device; and 6) an ability to respond to input from a computer mouse and/or keyboard. This disclosure is not limited to any particular UI. Those of skill in the art will recognize that many other UI embodiments are possible and fully within the scope and spirit of this disclosure.
Each service can be associated with an extension 208. An extension can expose and consume the services of other extensions. In one embodiment, a service is a public interface that has an implementation and provides access to functionality in an extension. An extension may declare services that it implements. For instance, a debugger extension can define a debugger service that, among other things, provides a method for setting a breakpoint in a program source file. Services can be consumed by an extension's classes and can be registered with the system using tags in the extensions.xml file.
In one embodiment, at startup a GIA run-time component can read all extension.xml files, batch them together and ensure that the services requested by each are available. Extensions may define handlers for an <extension-xml> tag found in the extension.xml file. Handlers are associated with a particular id attribute. In one embodiment, an extension.xml file can be scanned for code fragments contained within a <extension-xml> tag and those fragments can be passed to handlers defined for the particular id attribute at run-time. This mechanism allows extensions to create extendable infrastructure in which other extensions can participate. In one embodiment, a handler class can be instantiated by the GIA and is responsible for parsing XML contained in a fragment.
FIG. 3 is an exemplary illustration of a services in an embodiment. In one embodiment and by way of a non-limiting example, services can include: a resource service 300 to provide access to resources such as icons, images, and localizable strings; a frame service 302 to allow extensions to specify a GUI docking layout; a file service 304 that can provide a set of services for file system access and manipulation; a server service (not shown) to provide a set of services for accessing a server; a document services 306 to provide a means to supply an abstract document interface for files that are part of the application project; and an action service 308 to provide methods for adding and manipulating menu and toolbar items.
In one embodiment, the root element for the XML in the extension.xml file is <extension-definition>. An <extension-definition> element may have one or more <extension-xml> elements as children, each describing a different extension. The particular type of extension can be described by setting the value of the <extension-xml> element's id attribute. Exemplary values for the id attribute are given in Table 1.
By way of a non-limiting example, the following XML describes an extension that adds three GUI panels for setting properties in a GIA: one for a Project Properties dialog, one for an Application (workspace) Properties dialog, and one for a GIA Properties dialog:















<extension-definition>









<extension-xml id=“urn:com:settings”>









<project-preferences>









<panel









label=“%strings.workshop.debugger.extension.debuggerTab%”



class=“workshop.debugger.ui.DebuggerPreferencesPanel”/>









</project-preferences>



<workspace-preferences>









<panel









label=“%strings.workshop.debugger.extension.debugSourcepath%”



class=“workshop.debugger.ui.DebugSourcepathPreferences”



priority=“40”/>









</workspace-preferences>



<GIA-preferences>









<panel









label=“%strings.workshop.debugger.extension.debuggerViews%”



class=“workshop.debugger.ui.ExpressionViewPreferences”/>









</GIA-preferences>









</extension-xml>









</extension-definition>







Syntax:









<extension-xml id=“urnForExtensionType”>









<!-- Extension-specific XML. -->









</extension-xml>







Parents:









<extension-definition>







Children:









<file-extension>, <create-template>, <project-attributes>










Multiple <extension-xml> elements may occur as children of the <extension-definition> element, which is the root element of an extension.xml file.







TABLE 1







Exemplary Extension Types in an Embodiment









EXTENSION
EXTENSION



TYPE
DESCRIPTION
ID ATTRIBUTE SET TO





Document
Defines support
urn:com:document



for a document



type.


Actions
Defines menus,
urn:com:actions



popups, and toolbars,



along with their



associated behavior.


Encoding
Defines support
urn:com:encoding



for a file type.


Frame
Defines a frame
urn:com:frame



view (e.g., a



dockable window).


Help
Defines paths to
urn:com:help



search for help



topics when



context-sensitive



help is requested.


Settings
Defines a new
urn:com:settings



properties panel.


Project
Defines a new
urn:com:project



project type.


Debugger
Defines a new
urn:com:debugExpressionViews



debugger variable



view.









In one embodiment, the <action-ui> element can specify UI details for actions in a GIA. In general, this element can be used for defining new UI elements (e.g., menu and popup commands, toolbar buttons, etc.) associated with actions. By way of a non-limiting example:















<extension-xml>









<action-ui>









<action-group>









<menu>









<menu>









<action-group>









<popup>









<action-group>









<toolbar>









<action-group>









<action-set>









<action>









<location>









Syntax:









<action-ui>









<!-- Children that describe specific actions or groups of









actions. -->



</action-ui>









Parents:









<extension-xml>









Children:









<action-group>, <menu>, <toolbar>, <popup>










In one embodiment, a <menu> element can be used to specify a UI menu item. Attributes for this element are provided in Table 3. By way of a non-limiting example:















<extension-xml>









<action-ui>









<action-group>









<menu>









<extension-xml>









<action-ui>









<menu>









Syntax:









<menu









id=“nameToUseInContextPaths”



label=“labelInGIA”



[path=“uiContextPath”]



priority=“priorityNumber”









>









Parents:









<action-ui>, <action-group>









Children:









<action-group>

















TABLE 2







Exemplary <menu> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





id
The name of this menu item. The full context for



this action item can be determined by combining



this attribute with the path attribute.


label
The text to display for the menu in the GIA. A



programmer can also indicate the action's default



key-stroke accelerator by preceding it with



‘@’. If the label begins and ends with



the ‘%’ escape character, the label can be



interpreted as a Java TM PropertyBundle path.



The label (including accelerator) will be



determined by using the ResourceSvc to load



the property named by the path. Place ‘&’



before the character which is to be the menu mnemonic.


path
Optional string. A path through the UI hierarchy,



followed by the final group in the last menu. For



example, “menu/services/controls/add” would



locate an action in the “add” group, of the



“controls” sub-menu, of the “services”



menu, in the main menu. Use the id attribute to



specify the name of the menu item beneath “add”.


priority
This item's GUI priority.









In one embodiment, <action-group> adds a new action group to a ‘View’ menu. Action groups (and all other UI elements) are sorted with lowest priority numbers first. An action group is simply a place to put actions. If no actions are put in the action group, then it will not be visible in the UI. A separator can be shown between each visible command group. In one embodiment, a default priority can be provided. In another embodiment, a priority can be specified.















Syntax:









<action-group priority=“priorityNumber”>









Parents:









<action-ui>









Children:









<menu>, <action-ref>










In one embodiment, a <popup> element specifies a UI popup window or menu. The <popup> element's attributes are provided in Table 3.















<extension-xml>









<action-ui>









<popup>









Syntax:









<popup









id=“nameToUseInContextPaths”



path=“uiContextPath”









>









Parents:









<action-ui>









Children:









<action-group>

















TABLE 3







Exemplary <popup> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





id
The name of this item. The full context for this action



item can be determined by combining this attribute with



the path attribute.


path
A path through the UI hierarchy, followed by the final



group in the last menu. For example,



“menu/services/controls/add” would locate an action



in the “add” group, of the “controls”



sub-menu, of the “services” menu, in the main



menu. Use the id attribute to specify the name of



the menu item beneath “add”.









In one embodiment, a <toolbar> element can specify a UI toolbar or toolbar button. Its attributes are specified in Table 4.















Syntax:









<toolbar









id=“nameToUseInContextPaths”



label=“labelInGIA”



[path=“uiContextPath”]



priority=“priorityNumber”









>









Parents:









<action-ui>









Children:









<action-group>

















TABLE 4







Exemplary <toolbar> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





id
The name of this item. The full context for this



action item can be determined by combining this



attribute with the path attribute.


label
The text to display for the menu in the GIA. A



programmer can also indicate the action's default



key-stroke accelerator by preceding it with



‘@’. If the label begins and ends with



the ‘%’ escape character, the label is



interpreted as a Java PropertyBundle path. The



label (including accelerator) will be determined



by using the ResourceSvc to load the property



named by the path. Place ‘&’ before



the character which is to be the menu mnemonic.


path
Optional string. A path through the UI hierarchy,



followed by the final group in the last menu. For



example, “menu/services/controls/add” would



locate an action in the “add” group, of the



“controls” sub-menu, of the “services”



menu, in the main menu. Use the id attribute to



specify the name of the menu item beneath “add”.


priority
Required int.









In one embodiment, an <action-set> element can specify actions in an extension. It may occur multiple times as a child of <extension-xml>. Specific actions, such as a menu or popup command, or a toolbar button, are described by each <action> child element.















Syntax:









<action-set









scope=“classNameForView”



extends=“classNameForExtendedView”









>









Parents:









<extension-xml>









Children:









<action>

















TABLE 5







Exemplary <action-set> Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





scope
Optional string. The fully-qualified class name for



a view (a document, document view or frame view) that



is active in order for this action to be available.



Default is global scope, meaning that the actions in



this set may be accessible to the user regardless of



the active view.


extends
Optional string. The fully-qualified class name for



a view whose scope this action set extends. Extending



an action-set of an existing scope adds all the



actions of the base scope into the extending scope.









In one embodiment, an <action> element can specify a UI action, such as a menu or popup command, or a toolbar button. Attributes for this element are provided in Table 6.















Syntax:









<action









[class=“classNameForHandler”]



[label=“menuText”]



[tooltip=“tooltipText”]



[icon=“pathToGifFile”]



[id=“”]









>









Parents:









<action-set>









Children:









<location>

















TABLE 6







Exemplary <action> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





class
Optional string. The fully-qualified class name for



the class that defines this action. In one embodiment,



the class can have a parameter-less constructor and



implement an IAction interface. By way of a non-limiting



example, this interface can be a fairly simple extension



of Swing's own ActionListener interface. The interface



can also implement a listener to allow the action to



respond to property changes and update its state.



IAction Method Summary:



void actionPerformed(ActionEvent)



Invoked when an action occurs.



void propertyChange(PropertyChangeEvent)



Updates the state of this action using the given



property change event.


label
Optional string. The text to display for this action



in menus. Place ‘&’ before the character which



is to be the menu mnemonic. A programmer can also



indicate the action's default key-stroke accelerator



by preceding it with ‘@’. If the label begins and



ends with the ‘%’ escape character, the label is



interpreted as a Java PropertyBundle path. The label



(including accelerator) will be determined by using



the ResourceSvc to load the property named by the path.


tooltip
Optional string. The text to show as a tool tip



for a toolbar, in status bar for menus, or in



customization dialogs.


icon
Optional string. A path to an image resource to



show on toolbars and menus.


id
Optional string.









In one embodiment, a <location> element specifies a location in a GIA user interface (such as an existing menu group) where an action can be placed. This element is provided as a convenience for simple cases. In general, a programmer can define new user interface for actions with <action-ui> elements.















Syntax:









<location path=“path”>









Parents:









<action>









Children:









None.










In one embodiment, a <view> element allows the specification of new debugger variable view. The following non-limiting example uses the XmlExpressionView view implementation for a view of a string variable:















<extension-xml id=′′urn:com:debugExpressionViews′′>









<view









priority=′′80′′



valueType=′′java.lang.String′′



description=′′View as XML′′



class=”workshop.debugger.ui.expressionview.XmlExpressionV









iew”/>



</extension-xml>







Syntax:









<view









class=′′viewImplementation′′



description=′′viewDescriptionInGIA′′



matchesNulls=′′true | false′′



priority=′′rankingAmongViews′′



valueType=′′typeWhoseDataThisIsAViewFor′′









>







Parents:









<extension-xml>







Children:









<view>

















TABLE 7







Exemplary <view> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





class
The fully-qualified name of the class that provides



the custom view. In one embodiment, this class can



implement an IDebugExpressionView interface. This



interface is responsible for displaying, editing, and



populating the children of an expression in locals



and watch windows of a GIA debugger. Watch windows



can add, remove, or completely specify which fields



to show, and provide custom renderers and editors for its



values.



Implementing classes class can have a argument-less



constructor, as they can be instantiated using



Class.newInstance( ). Mappings between types



and which views they should use can be specified in



extension.xml.



Views can also used to render the hovering value



tooltip in the source editor when debugging. The



default view is always used for these tooltips.



When inserting a view, it can be first instantiated



using Class.newInstance( ), then init( ) is called,



and it is then added to its parent in the tree.



If there are exceptions thrown when instantiating a



debugger view, they can be logged to a file, and



the matching view with the next highest priority



can be instantiated. Common causes of problems



include classpath issues that prevent the class



from being found by the classloader, not having



a public argument-less constructor, or having an



exception thrown in the view's constructor.


description
The description to display for the view when the



user right-clicks.


priority
A number indicating this view's ranking among views



for variables of this type.


valueType
The fully-qualified name of the type to provide



this view for.









In one embodiment, a <document-handler> element describes a document extension, with which a programmer can add to the GIA to support new document types. New document types may require a specific user interface (such as an icon) and behavior. The extension.xml file for a document extension can specify the class to use for handling the new type of document, the document's file extension, and so on.















Syntax:









<document-handler









class=“handlerClassName”



icon=“pathToIcon”



label=“descriptiveTextForDocumentType”









>









Parents:









<extension-xml>









Children:









<file-extension>, <create-template>, <project-attributes>

















TABLE 8







Exemplary <document-handler> Element


Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





class
The fully-qualified name of the handler class for



this document type. In one embodiment, the specified



class can implement an IDocumentHandler interface.



The IDocumentHandler is a basic interface that the



document service can use to map a URI to an IDocument



interface. Handlers are registered with the IDE at



startup using extension.xml. The extension XML allows



the specification of a set of project attributes that



can be used to limit the scope of a document handler



to specific sets of projects. Attributes may



be required by the handler on the project that



contains a document it opens.


icon
Path to an image that can be used to represent



this file type. This will be used, for example,



to allow the Application window to display an image



next to the file name.


label
A plain text description of this file type. This



will be used as explanatory text where appropriate.









In one embodiment, the <document-handler> element may have one or more <file-extension> child elements. These can be used to specify the extension of a file for which this document handler may be used. Attributes are discussed in Table 9.















Syntax:









<file-extension









priority=“prioritySetting”



[handler=“handlerName”]









>









Parents:









<document-handler>









Children:









None

















TABLE 9







Exemplary <file-extension> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





priority
The ranking of the handler for this file extension.



The priority attribute captures a relative ranking



of how well the handler understands this particular



extension. A document service can use this to find



a default handler for a given file extension. It will



choose the handler with the highest priority. In the



event of a tie, one of the handlers with the highest



priority can be arbitrarily chosen.



Possible values are: lowest, low, medium, high,



highest, unknown and info-only. A value of



“unknown” indicates that the handler can



actually inspect the contents of the file in order



to determine what priority it actually has. A value



of “info-only” indicates that the handler does



not possess any knowledge of the contents of the



file, but merely provides an icon and description.


handler
Optional string. In one embodiment, an



′′unknown′′ priority value indicates that the



handler can actually inspect the contents of a file in



order to determine what priority it actually has. By



way of a non-limiting example, imagine a Dialog editor



that understands files Java TM files, but only if the



class extends the JDialog class. If no ′′highest′′



handler is available for a file at run time,



′′unknown′′ handlers can be given the opportunity



to inspect the file and return one of the six more



specific priority values. The highest priority among



the ′′unknown′′ type handlers and any remaining



non-′′highest′′ handlers will be designated as the



default handler for a file.









In one embodiment, a programmer will most often implement “highest” priority handlers, but a programmer may also have “low” and “medium” priority handlers. For example, the extension .java can have a high priority handler that handles JAVA files. However, the extension .jws is also a JAVA file. In the absence of a “highest” priority handler for it (in other words, the web services extension), the JAVA file handler can be able to also handle JWS files. Therefore, the JAVA file handler may declare itself to be a “low” priority handler for files with a jws extension.
In one embodiment, a <create-template> element can specify information used in a right-click UI menu and/or a New File dialog when creating a new file of this type.















Syntax:









<create-template









[id=“id”]









priority=“priorityNumber”









[createCategories=“fileCategories”]



[label=“descriptiveText”]









>









Parents:









<document-handler>









Children:









<description>

















TABLE 10







Exemplary <create-template> Element


Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





priority
A number indicating this handler's ranking for



this file type.


label
A plain text description of this file type.



This can be used as explanatory text where



appropriate.


createCategories
Categories in the New File dialog under which



this file type will appear. Make this value



“ShortCut” to specify that the file



type can appear on the right-click menu.


id
Optional string.









In one embodiment, a <description> element can be used to specify text that can appear for this file type in the New File dialog.















Syntax:









<description>



Description text that appears for file type in the New File



dialog.



</description>









Parents:









<create-template>.









Children:









None.










In one embodiment, an <file-encoding> element can be used to describe a file encoding extension. A programmer can use a file encoding extension to specify how a file can be handled when parsing. By way of a non-limiting example, if a programmer wanted files with an .htm extension to be treated by the GIA in the same way as files with an .html extension, the extension might look as follows:















<extension-xml>









<file-encoding appliesTo=“htm” treatAs=“html”/>









</extension-xml>









Syntax:









<file-encoding









appliesTo=“handlerClassName”



[class=“pathToIcon”]



[treatAs=“descriptiveTextForDocumentType”]









>









Parents:









<extension-xml>









Children:









None.

















TABLE 11







Exemplary <file-encoding> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





appliesTo
The extension or extensions for files this encoding



extension applies to.


class
The fully-qualified name of a class to use for



handling files with this extension.


treatAs
The extension of files whose handler can be used



to handle files this encoding extension applies to.









In one embodiment, a <frame-view-set> can be used to specify one or more UI frame views. A programmer can use the <frame-view> element to define certain appearance and behavior properties for the view in the GIA.















Syntax:









<frame-view-set>









<!-- frame-view elements to specify new frames -->









</frame-view-set>









Parents:









<extension-xml>









Children:









<frame-view>










In one embodiment, a <frame-view> element can describe an extension that adds a dockable frame window to the GIA UI. The extension can provide basic information about the frame, including its label in the UI, its icon in menus, and a class that implements the UI and behavior for the frame. In addition, a programmer can use an <application-layout> element to specify that frames can be visible in specific positions at startup.















Syntax:









<frame-view









askavailable=“true | false”



class=“classNameForViewImplementation”









[hasaction=“true | false”]



[icon=“pathToGifFile”]



[id=“identifierForThisView”]



label=“labelToDisplayInUI”









>









Parents:









<frame-view-set>









Children:









None.

















TABLE 12







Exemplary <frame-view> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





askavailable
Optional boolean. Set to “True” to specify



that this view implements an IFrameView, and



that its isAvailable( ) method can be called



to determine whether the frame can be shown.



Implement this interface, or derive from



JComponent for all classes specified in the



‘class’ attribute of a <frame-view> tag.



IFrameView's benefits over using a simple



JComponent are, that it can provide a



‘Component’ other than itself, for cases



where component construction is more complex,



and it can specify the view's ‘availability’



dynamically.


class
The fully-qualified class name of the frame view



implementation. the class that is your



implementation of the view - its user interface



and behavior. A frame view implementation class



can extend Component, implement IFrameView,



or both.


hasaction
True to specify that a menu item for this view



cannot be shown in a generated frame view menu.


icon
Path to a GIF file that can be used to represent



this view in menus.


id
An identifier to distinguish between multiple



instances of the implementation class.


label
The label used in the view tab, and in the



View menu.









In one embodiment, an <application-layout> element can specify parameters for frame layouts, or descriptors that specify startup positions for frame views. This element can be used to create multiple frame views in the GIA UI.















Syntax:









<application-layout









id=“layoutInWhichTheseLayoutsShouldAppear”









>









Parents:









<extension-xml>









Children:









<frame-layout>

















TABLE 13







Exemplary <application-layout> Element


Attributes in an Embodiment










ATTRIBUTE
DESCRIPTION







id
Identifier for the application layout to which




this element's children can be applied. In one




embodiment, valid values include “main” and




“urn:com:debug”.










In one embodiment, a <frame-layout> element can specify the parameters of a layout, or the specific positions of one or more frame views at GIA startup.















Syntax:









<frame-layout









id=“frameLayoutID”









>









Parents:









<application-layout>









Children:









<frame-container>

















TABLE 14







Exemplary <frame-layout> Element Attributes in an Embodiment










ATTRIBUTE
DESCRIPTION







id
Id of the frame layout to which the children can




be applied. The valid value is “main”.










In one embodiment, a <frame-container> element can specify layout parameters for a group of frame view windows. This element can be used when there are two or more frame views that can appear in specific positions relative to each other at startup.















Syntax:









<frame-container









[orientation=“orientationInGIA”]



proportion=“percentageOfGIASpace”









>









Parents:









<frame-layout>









Children:









<frame-view-ref>, <frame-container>.

















TABLE 15







Exemplary <frame-container> Element


Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





orientation
This container's orientation in the layout. Valid



values are “tabbed”, “root”, “north”, “south”,



“west”, or “east”. Valid only on the root



<frame-container> in a <frame-layout> element.


proportion
The percentage of space that this container can



occupy in the GIA. For example, a container



oriented “south” with a proportion of “25%”



would occupy the lower 25 percent of the GIA. As



with HTML tables, proportions need not add up



to 100 percent.









In one embodiment, a <frame-view-ref> element can specify a frame view to appear in a container. Within the <frame-container> element, which defines layout parameters, the <frame-view-ref> element specifies details about the frame itself.















Syntax:









<frame-view-ref









class=“frameViewImplementationClass”









[id=“frameLayoutID”]



[proportion=“percentageOfContainerSpace”]



[visible=“true | false”]









>









Parents:









<frame-container>









Children:









None.

















TABLE 16







Exemplary <frame-view-ref> Element


Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





class
The fully-qualified class name of the frame



view implementation.


id
An identifier to distinguish between multiple



instances of the implementation class.


proportion
The percentage of space that this container



can occupy in the container. For example, a



container oriented “south” with a proportion



of “25%” would occupy the lower 25 percent of



the GIA. As with HTML tables, proportions need



not add up to 100 percent.


visible
Boolean: false to hide this frame on startup.









In one embodiment, the <help-root> describes a help extension through which a programmer can specify paths that can be added to the locations searched by the GIA when context-sensitive help is requested. By way of a non-limiting example, when a user presses an F1 key, a context-sensitive help engine can search for a topic (e.g., an HTML file) that corresponds to the user's current context (such as Source View, with the cursor positioned in a class variable name).















Syntax:









<help-root









dir=“pathRelativeToParent”



parent=“parentForHelpPaths”



url=“urlToHelpRoot”









>









Parents:









<extension-xml>









Children:









None.

















TABLE 17







Exemplary <help-root> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





dir
Optional string. The directory to search as



a help root. This directory is relative to the



value specified in the parent attribute.


parent
Optional string. A path to a JAR file or



directory relative to the WebLogic Workshop



extensions directory. An absolute path may be



used, but it is not recommended. If this



attribute is omitted, the directory is assumed to



be in the extension's own JAR file or directory.


url
Optional string. An absolute URL that specifies



a new help root. This may be any URL, but will



typically be HTTP or file based. Set this



attribute's value as an alternative to setting



the dir and parent attribute values.









In one embodiment, a <GIA-preferences> element can describe a preferences extension, which can add one or more panels to the GIA properties dialogs. These dialogs can include GIA Properties, Project Properties, and Application Properties (also known as “workspace properties”). For each of these dialogs, a programmer can specify one or more panels with the <panel> child element.















Syntax:









<GIA-preferences>









<!-- panel elements that define user interface for the









properties panel -->



</GIA-preferences>









Parents:









<extension-xml>









Children:









<panel>










In one embodiment, a <workspace-preferences> element can specify one or more panels that can be included in the Application Properties dialog.















Syntax:









<workspace-preferences>









<!-- panel elements that define user interface for the









properties panel -->



</workspace-preferences>









Parents:









<extension-xml>









Children:









<panel>










In one embodiment, a <project-preferences> element can specify one or more GUI panels that can be included in the Project Properties dialog.















Syntax:









<project-preferences>









<!-- panel elements that define user interface for the









properties panel -->



</project-preferences>









Parents:









<extension-xml>









Children:









<panel>










In one embodiment, a <panel> element can specify a panel that can appear in a properties dialog.












Syntax:









<panel









class=“implementationClassName”



label=“labelForThisPanelInDialog”



[priority=“numberForDisplayRanking”]









>







Parents:









<GIA-preferences>, <workspace-preferences>, <project-preferences>







Children:









None.

















TABLE 18







Exemplary <panel> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





class
The fully-qualified name of the panel's



implementation class.


label
The name that can appear in the properties dialog,



and which the user clicks to select the panel.


priority
Optional int. A number indicating the ranking



for this panel in the list of panels.









In one embodiment, a <project-type> element can specify details related to the project's appearance in the GIA and about a project type file name extension.















Syntax:









<project-type









id=“IdentifierForProjectType”



closedfoldericon=“pathToGifFile”



icon=“pathToIcon”



label=“descriptiveTextForDocumentType”



openfoldericon=“pathToGifFile”









>









Parents:









<extension-xml>









Children:









<attribute>, <driver>

















TABLE 19







Exemplary <project-type> Element Attributes in an Embodiment










ATTRIBUTE
DESCRIPTION







id
An identifier for this project type. This




can be a short name representing this project




type -- for example, “php” for a PHP project




type.



closedfoldericon
The path to the .gif file representing the




top-level folder of a project of




this type when the folder is closed.



icon
The path to the .gif file to use for




representing this project type in the UI.



label
The text to display for this project type in




the New Project dialog.



openfoldericon
The path to the .gif file representing the




top-level folder of a project of




this type when the folder is open.










In one embodiment, an <attribute> element can specify an attribute supported by a project type. In one embodiment, project type attributes can correspond to predefined behavior in the GIA. By way of a non-limiting example, specifying “true” for the warnOnXSDAdd attribute tells the GIA that a warning message can be displayed if a GIA user tries to add an XSD file to the project (the warning states that the XSD will not be compiled unless put into a schema project).















Syntax:









<attribute









name=“attributeName”



value=“attributeValue”









>









Parents:









<project-type>









Children:









None.

















TABLE 20







Exemplary <attribute> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





name
The name of the attribute whose value is being specified.


value
The attribute's value.









In one embodiment, a <driver> element can specify driver(s) to load when a project of this type is loaded. By way of a non-limiting example, a programmer might want to implement a driver that checks for files added to the project's file system. When the user adds a project of this type to an application, the GIA “attaches” each of the specified drivers to it, so that the driver code is running while the user is working in the application. The project itself need not have focus in order for drivers to be active.















Syntax:









<driver









class=“driverImplementationClass”



type=“driverInterface”









>









Parents:









<project-type>









Children:









None.

















TABLE 21







Exemplary <driver> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





class
Required string. The fully-qualified name of the



driver implementation. This class can implement



the interface specified in the type attribute.


type
Required string. The fully-qualified name of the



driver interface.









In one embodiment, a template defines a set of files and/or code to be used to check the contents of or add content to a GIA project. In one embodiment and by way of a non-limiting illustration, the GIA can load its set of templates by finding zip files with a template.xml file at its root located in a ‘templates’ directory.
In one embodiment, a template.xml file may contain any number of project or application template definitions. A template definition may optionally include display information indicating where and how the template will be displayed to the user. All templates, regardless of whether they contain display information, can be accessed programmatically by extension writers, or be extended or referenced by other template definitions.
In one embodiment, a <template-definition> element is the top-level element for project templates. It can contain any number of <project-template> and <application-template> elements.












Syntax:









<template-definition>









<!-- Children <project-template> and <application-template>









elements. -->



</template-definition>







Parents:









None







Children:









<project-template>, <application-template>










In one embodiment, a <project-template> element can be used to define a set of content for populating a single new or existing project of a specific project type. A project template can also use a custom template processor class located in an extension JAR to call a GIA extension API, examine and update configuration files, query the user for input, or control the addition of content to a source directory. In one embodiment, project template definitions may be displayed in a New Project Dialog, Import Project Dialog, or in an application tree project-context menu under Install. They may also be extended by other project templates and referenced by application templates.
In one embodiment, a project template can be used by an template processor class to examine, configure or populate a project instance. In one embodiment, a template processor can have two methods: check( ) which determines if the project conforms to the template, and load( ) which configures or adds content to the project. A custom template processor implementation may be specified in the template definition; otherwise the default Workshop implementation will be used.















Syntax









<project-template









type=“projectType”



id=“projectID”



[extends=“extendedProjectID”]



[processor=“IProjectTemplateProcessor”]









>









Parents:









<template-definition>









Children:









<display>, <content>

















TABLE 22







Exemplary <project-template> Element


Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





type
Identifies the type of project that will be



created. Project types can be defined in



extension.xml and define how the project builds,



deploys and runs, as well as how this template



will be processed.


id
Uniquely identifies this template among all



templates defined for its project type. Note that



this id does not have to be unique among all



project templates.


extends
Points to the id of a template of the same project



type that this template extends. If this attribute



is set, then un-initialized, non-required attributes



can be set to values from the extended template.


processor
Class name of a template processor implementation.



If this attribute is omitted, then a default



processor implementation will be created.









In one embodiment, a <display> element can display options for a New Project dialog.















Syntax:









<display









location=“ newdialog | importdialog | contextmenu ”



[label=“projLabel”]



[icon=“imageName”]



[description=“projDescription”]



[priority=“menuLocationInteger”]



[categories=“projCategory1, projCategory2, ...”]









>









Parents:









<project-template>









Children:









None.

















TABLE 23







Exemplary <display> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





location
Comma separated list of display location identifiers.



Workshop-defined values:



newdialog - a New Project dialog



importdialog - an Import Project dialog



contextmenu - a project context menu


label
Label that can be displayed in the New Project dialogs.


icon
Icon that can be displayed for this template. All



project types will specify a default icon which will



be used if this attribute is omitted. The value of



this attribute may be a GIF file in the template ZIP



file, or it may be a resource in an extension JAR file.


description
Optional string. Description of this template that



will be displayed in the Project dialogs.


priority
Optional integer. Used to order the templates



displayed in the dialog template list, higher values



being displayed before lower values.


categories
Optional string. Comma separated list of template



category names.









In one embodiment, a <content> element can be used to specify a menu item.















Syntax:









<content









type=“ archive | file ”



destination=“ project | libraries | modules ”



source=“sourceFileOrZIP”









[overwrite=“ true | false ”]









>









Parents:









<project-template>









Children:









None.

















TABLE 24







Exemplary <content> Element Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





type
Indicates how the source file can be processed.



Values supported by the default template processor:



archive - a zip file



file - a file


destination
Where the content will be placed. Values supported



by the default template processor:



project - the root of the project directory



libraries - the application Libraries directory



modules - the application Modules directory


source
The content source file; when opening as a stream,



will first look in the template ZIP file, then it



try to open the content as a resource.


overwrite
Optional boolean. Specifies the behavior if same



files already exist in the application directories.



If this attribute is omitted, the value is false.



The default template processor will immediately



quit processing this content element if



overwrite is false and a collision occurs.









In one embodiment, an <application-template> element can be used to define a set of content for populating a new or existing application. An application template can also use a custom template processor class located in an extension jar to call an GIA extension API, examine and update configuration files, query a user for input, or control the addition of content to the application directory. By way of a non-limiting example, application template definitions may be displayed in a New Application Dialog, or in a application tree root context menu under Install. They may also be extended by other application templates and referenced by application templates.
Application templates may also contain any number of content elements, however these content members may only contain application-level data: data in the Libraries, Modules folders, etc. Project content can be specified in a project template. Project templates may be referenced, or they may be completely defined inside the application template. Project templates defined inside the application template will not appear in the New Project and Add Project dialog and may only be used when creating this application.















Syntax:









<application-template









id=“uniqueID”









>









Parents:









<template-definition>









Children:









<display>, <content>, <project-template-ref>

















TABLE 25







Exemplary <application-template> Element


Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION





id
Uniquely identifies this application template



among all application templates defined in this



template zip file. Note that this id does not have



to be unique among all application templates loaded



by Workshop.









In one embodiment, a <project-template-ref> element can be used to reference to an externally defined project template. The referenced project template may be defined in the current template ZIP file, or any other template ZIP file in the /template directory. The project type id and template id are used to find the referenced project template. The referenced project template will be used to create a project with the name given and the content defined by the project template.















Syntax:









<project-template-ref









[default-name=“name”]



[type=“projType”]



[template=“projTemplateID”]









>









Parents:









<application-template>









Children:









None.

















TABLE 26







Exemplary <project-template-ref> Element


Attributes in an Embodiment








ATTRIBUTE
DESCRIPTION











default-name
The name that will be used for the created project.









type
A project
Possible values:



type id.



TYPE
DESCRIPTION



Datasync
Datasync projects contain server




data including campaigns, content,




placeholders, content selectors,




user segments, and property sets.



Control
Control projects are used to create




Java controls and packaging them




as JAR files.



WebApp
WebApp projects can contain web




applications, web services,




and business processes.



EJB
EJB projects are used to create




EJBs and packaging them as JAR files.



PortalWebApp
A WebApp project that also enables




Portals. This can only be added




to an portal enabled application.



xbean
Schema project for building




XMLBean JARs from schema files




(XSD files).








template
A project template id.









The following is an annotated example of a template.xml file.












<template-definition>


<!-- This a Web project template and extends the ‘default’ Web


project template. -->









<project-template id=“_example_proj1_”









type=“urn:com:project.type:WebApp”



extends=“default”







processor=“workshop.workspace.project.TestTemplateProcessor”>









<!-- Defines where and how this template will be







displayed to the Workshop user. -->









<display









location=“newdialog, importdialog”



label=“_Example Project_”



description=“This project template demonstrates the







Workshop template syntax, and extends the default web project


template. See {wlw_install_dir}/templates/example-template.zip.”









icon=“exampleProject.gif”



priority=“0”



categories=“_Example_” />









<!-- zip to be extracted at the root of the project







directory -->









<content type=“archive” destination=“project”







source=“default-project.zip”/>









<!-- file to be put in the libraries directory -->



<content type=“file” destination=“libraries”







source=“CreditScoreBean.jar” overwrite=“true”/>









<!-- file to be put in the modules directory -->



<content type=“file” destination=“modules”







source=“CreditScoreEJB.jar” overwrite=“true”/>









</project-template>



<!-- This a Web project template that will appear in the







Application tree's Install context menu









when the user right-clicks on a Web project folder.



Note that this template uses a custom template processor







implementation. This class could









query the user for input, examine and update existing







configuration files, and control how









content elements are added to the project. -->









<project-template id=“_example_proj1_installmenu_”









type=“urn:com:project.type:WebApp”







processor=“workshop.workspace.project.InstallTemplateProcessor”>









<!-- Defines where and how this template will be







displayed to the Workshop user. -->









<display









location=“contextmenu”



label=“_Add Project Resources_”



description=“This project template demonstrates the







Workshop template syntax, and extends the default web project


template. See {wlw_install_dir}/templates/example-template.zip.”









icon=“exampleProject.gif”



categories=“_Example_” />









<!-- zip to be extracted at the root of the project







directory -->









<content type=“archive” destination=“project”







source=“ui_resouces.zip”/>









</project-template>







<application-template id=“_example_app1_”>









<display









location=“newdialog”



icon=“exampleApp.gif”



label=“_Example Application 1_”



description=“This application template demonstrates







the Workshop template syntax. See


{wlw_install_dir}/templates/example-template.zip.”









priority=“1”



categories=“_Example_” />









<!-- zip to be extracted in the libraries directory -->



<content type=“archive” destination=“libraries”







source=“libraries.zip”/>









<!-- file to be put in the modules directory -->



<content type=“file” destination=“modules”







source=“testEJB.jar”/>









<!-- references a project template defined in another







template zip file -->









<project-template-ref default-name=“_StandardControl_”







type=“Control” template=“default”/>









<!-- references a project template defined above -->



<project-template-ref default-name=“_ExampleWebApp_”







type=“urn:com:project.type:WebApp” template=“_example_proj1_”/>









<!-- project template only used in this application







template -->









<project-template default-name=“_Example Java_”









id=“_example_app1_proj1_”



type=“Java”>









<content type=“file” destination=“project”







source=“Example.java”/>









</project-template>









</application-template>



<!--









This application template extends an application template







defined in this









template zip. Currently we only support extending app







templates defined









in the same template zip.









 -->



<application-template id=“_example_app2_”









extends=“_example_app1_”>









<display









location=“contextmenu”



label=“_Example Application Content_” />









<!-- A project template only used in this application







template.









 Extends the default control project -->









<project-template default-name=“_ExampleControl_”









id=“_example_app2_proj1_”



type=“Control”



extends=“default”>









<content type=“file” destination=“project”







source=“Example.java”/>









</project-template>









</application-template>







</template-definition>









One embodiment may be implemented using a conventional general purpose or a specialized digital computer or microprocessor(s) programmed according to the teachings of the present disclosure, as will be apparent to those skilled in the computer art. Appropriate software coding can readily be prepared by skilled programmers based on the teachings of the present disclosure, as will be apparent to those skilled in the software art. The invention may also be implemented by the preparation of integrated circuits or by interconnecting an appropriate network of conventional component circuits, as will be readily apparent to those skilled in the art.
One embodiment includes a computer program product which is a storage medium (media) having instructions stored thereon/in which can be used to program a computer to perform any of the features presented herein. The storage medium can include, but is not limited to, any type of disk including floppy disks, optical discs, DVD, CD-ROMs, microdrive, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, nanosystems (including molecular memory integrated circuits), or any type of storage media suitable for storing instructions and/or data.
Stored on any one of the computer readable medium (media), the present invention includes software for controlling both the hardware of the general purpose/specialized computer or microprocessor, and for enabling the computer or microprocessor to interact with a human user or other mechanism utilizing the results of the present invention. Such software may include, but is not limited to, device drivers, operating systems, execution environments/containers, and applications.
The foregoing description of the preferred embodiments of the present invention have been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations will be apparent to the practitioner skilled in the art. Embodiments were chosen and described in order to best explain the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention, the various embodiments and with various modifications that are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalents.

## Claims

1. A computer-readable storage media having stored thereon computer instructions for a computer-based extendable application framework that when executed by a processor cause the instructions to provide:
a user interface;
a plurality of services, wherein a service includes a public interface that has an implementation and provides access to functionality in an extension of a plurality of extensions;
said plurality of extensions to extend an application, wherein the plurality of extensions provide functionality accessible in the user interface, wherein each extension in the plurality of extensions include:
a set of classes defined in an object-oriented programming language,
an XML (Extensible Markup Language) description,
wherein the XML description is scanned for code fragments that are contained within an XML tag and are to be passed to handlers defined for a particular ID attribute at runtime to batch together XML descriptions from other extensions of the plurality of extensions and ensure services requested by the XML description are available,

an optional set of resources, and
wherein the extension of the plurality of extensions defines handlers for the XML tag found in the XML description;

wherein each one of the plurality of services is associated with an extension in the plurality of extensions;
wherein one of the plurality of extensions exposes and consumes services associated with another extension in the plurality of extensions, wherein the exposed and consumed services are consumed by the set of classes;
wherein one of the plurality of extensions provides functionality accessible in the user interface;
wherein one of the plurality of services provides access to functionality in one of the plurality of extensions; and
wherein the XML description comprises a root element comprising one or more children elements that each describe a different type of extension.

2. The computer-readable storage media of claim 1 wherein: one of the plurality of extensions utilizes one of the plurality of services.

3. The computer-readable storage media of claim 1 wherein: each extension of the plurality of extensions is an interchangeable application building block.

4. The computer-readable storage media of claim 1 wherein:
a first extension of the plurality of extensions provides functionality to support at least one of: 1) a document type; 2) a user interface action; 3) a file encoding; 4) property settings; and 5) debugging information.

5. A computer-based method for configuring an application in a computer-based extendable application framework, comprising the steps of:
providing a user interface at a computer to allow user interaction with the application;
providing a plurality of extensions at the computer to extend the application, wherein each extension of the plurality of extensions include:
a set of classes defined in an object-oriented programming language,
an XML (Extensible Markup Language) description,
wherein the XML description is scanned for code fragments that are contained within a XML tag and are to be passed to handlers defined for a particular ID attribute at runtime to batch together XML descriptions from other extensions in the plurality of extensions and ensure services requested by the XML description are available,

an optional set of resources, and
wherein the extension of the plurality of extensions defines handlers for the XML tag found in the XML description;

wherein the providing of the plurality of extensions permits one of the plurality of extensions to provide functionality accessible in the user interface; and
providing a plurality of services wherein the providing the plurality of services permits one of the plurality of services to provide access to functionality in one of the plurality of extensions;
wherein each service of the plurality of services include a public interface that has an implementation and provides access to functionality in an extension;
wherein each one of the plurality of services is associated with an extension in the plurality of extensions;
wherein one of the plurality of extensions exposes and consumes services associated with another extension in the plurality of extensions, wherein the exposed and consumed services are consumed by the set of classes; and
wherein the XML description comprises a root element comprising one or more children elements that each describe a different type of extension.

6. The method of claim 5 wherein: one of the plurality of extensions utilizes one of the plurality of services.

7. The method of claim 5 wherein: each extension of the plurality of extensions is an interchangeable application building block.

8. The method of claim 5 wherein: an extension of the plurality of extensions provides functionality to support at least one of: 1) a document type; 2) a user interface action; 3) a file encoding; 4) property settings; and 5) debugging information.

9. A computer-readable storage medium having stored thereon computer instructions for a computer-based extendable application framework system that when executed by a processor cause instructions for system to:
provide a user interface to allow user interaction with an application;
provide a plurality of extensions to extend the application, wherein the plurality of extensions provide functionality accessible in the user interface, wherein each extension of the plurality of extensions includes:
a set of classes defined in an object-oriented programming language, and
an XML (Extensible Markup Language) description,
wherein the XML description is scanned for code fragments that are contained within an XML tag and are to be passed to handlers defined for a particular ID attribute at runtime to batch together XML descriptions from other extensions in the plurality of extensions and ensure services requested by the XML description are available,

an optional set of resources, and
wherein the extension of the plurality of extensions defines handlers for the XML tag found in the XML description;

wherein the providing of the plurality of extensions permits one of the plurality of extensions to provide functionality accessible in the user interface;
provide a plurality of services wherein the providing of the plurality of services permits one of the plurality of services to provide access to functionality in one of the plurality of extensions;
wherein each service of the plurality of services includes a public interface that has an implementation and provides access to functionality in an extension of the plurality of extensions;
wherein each one of the plurality of services is associated with an extension in the plurality of extensions;
wherein one of the plurality of extensions exposes and consumes services associated with another extension in the plurality of extensions, wherein the exposed and consumed services are consumed by the set of classes; and
wherein the XML description comprises a root element comprising one or more children elements that each describe a different type of extension.

10. The computer readable storage medium of claim 9 wherein:
one of the plurality of extensions utilizes one of the plurality of services.

11. The computer readable storage medium of claim 9 wherein:
each extension of the plurality of extensions is an interchangeable application building block.

12. The computer readable storage medium of claim 9 wherein:
an extension of the plurality of extensions provides functionality to support at least one of: 1) a document type; 2) a user interface action; 3) a file encoding; 4) property settings; and 5) debugging information.

13. The computer-readable storage media of claim 1, wherein the plurality of services includes at least one of:
a resource service to provide access to a set of resources;
a frame service to allow extensions of the plurality of extensions to specify a graphical user interface (GUI) docking layout;
a file service to provide a set of services for file system access and manipulation;
a server service to provide a set of services for accessing a server;
a document service to supply an abstract document interface for files that are part of an application project; and
an action service to provide methods for adding and manipulating menu and toolbar items.

14. The method of claim 5, wherein the plurality of services includes at least one of:
a resource service to provide access to a set of resources;
a frame service to allow extensions of the plurality of extensions to specify a graphical user interface (GUI) docking layout;
a file service to provide a set of services for file system access and manipulation;
a server service to provide a set of services for accessing a server;
a document service to supply an abstract document interface for files that are part of an application project; and
an action service to provide methods for adding and manipulating menu and toolbar items.

15. The computer readable storage medium of claim 9, wherein the plurality of services includes at least one of:
a resource service to provide access to a set of resources;
a frame service to allow extensions of the plurality of extensions to specify a graphical user interface (GUI) docking layout;
a file service to provide a set of services for file system access and manipulation; a server service to provide a set of services for accessing a server;
a document service to supply an abstract document interface for files that are part of an application project; and
an action service to provide methods for adding and manipulating menu and toolbar items.