1. Support for context-dependent XML namespace insertion for XML, SVG, and XLINK: If we are in namespace `svg` the the namespace `xlink` has to be written in front of the attribute `href`, but `svg` does not have to be written in from of `fill`.
2. Added support for various SVG entities.

* [DCG_CONTENT,EXT] Words are allowed to contain hyphens again.
* [SVG,EXT] The rules for SVG fragments were rewritten in the common architecture.
* [SVG,SC] Removed rule for SVG header.
* [SVG,DEB] Added unit test for SVG document rule.
* [SVG_ATTRIBUTES,EXT] Added support for the xmlns / XML namespace attribute.
* [SVG_ATTRIBUTES,SC] Added svg_attributes//; all specific attributes go via this. Decides whether or not an XML namespace is needed.
* [SVG_ENTITIES,EXT] Added support for SVG definitions, descriptions, groups, symbols, titles, and uses.
* [SVG_ENTITIES,SC] Added svg_entity//4; all specific entities go via this.  Decides whether or not an XML namespace is needed.
* [XLINK,EXT] Added support for the href property.
* [XLINK,SC] Automatic checking of whether an XML namespace is needed or not.
1. Simplified the treatment of XML namespaces by languages that use XML (such as SVG and XLINK).
2. Simplified the treatment of XML attributes (especialy those consisting of a list of separated values).

* [DCG_CONTENT,SC] Renamed void// and word// to dcg_void// and dcg_word//.
* [SVG,SC] Added svg_namespace//1 to simplify setting the SVG namespace.
* [SVG_ATTRIBUTES,EXT] Added support for the referencedFeatures attribute.
* [SVG_ATTRIBUTES,SC] Simplified svg_attribute//'s namespace handling.
* [SVG_ENTITIES,EXT] Added support for image and switch entities.
* [SVG_ENTITIES,SC] Simplified svg_entity//'s namespace handling.
* [XLINK,SC] Simplified xlink_attribute//'s namespace handling, using xlink_namespace//1.
* [XML_DCG,SC] Removed xml_attribute//2 and xml_entity//2 from the API (a namespace DCG is now required).
* [XML_DCG,SC] Merged the injection of trees and return/production parameters into the new xml_attribute//4, making public calls to xml_attribute_list//4 superfluous.
* [XML_DCG,SC] Removed xml_inject_attributes//3.
1. Big cleanup and reorganization of the standards codebase.
2. Big reorganizaton of the XML related code.

* [SC] Cleanup of much of the standards code: datatime, URI, ISO, RFC, language, geography.
* [DCG_CADINAL,EXT] Added version for the single-digit rules that also return the code.
* [DCG_UNICODE,NEW] New module with support for 5 Unicode characters.
* [STANDARDS,SC] Standards support meta-data completely reorganized.
* [SVG_ATTRIBUTES,EXT] Added support for externalReqourcesRequered, requiredExtensions, systemLanguage.
* [XML,SC] Reorganization of the XML modules, integration between old DOM and new DCG modules:
** Module XML defines the namespace and the top DCG rules.
** Module XML_DOM contains the old DOM predicates.
** Module XML_ATTRIBUTES, XML_DATATYPES, XML_ENTITIES implement the DCG rules.
* [XML_ATTRIBUTES,EXT] Added support for id, lang.
* [XML_DATATYPES,EXT] Added support for boolean, yes/no, XML name (including much if the character definitions).