The third file provides that. In my example, the 'course description' has a series of recurring components which are discrete but which apply to all course descriptions throughout the institution and which can provide effective. All of these, in SGML and XML, exist as separate parts of the XML document. They are not called until that 'document' is assembled by the viewer's request to 'see English 317'. Each handles only the components for which it has authority, but also has experience.
Records remain intact, complete and 'owned'.
This gets us started. This is what XML brings to the document equation and this is the base and focus of our study and training. If you grasp this central feature, that XML provides the structure of the components of a document in a complete and efficient way, you have the reason why large corporations and government agencies, dealing with millions of pieces of information, require it, and spend millions of dollars to acquire it and then spend millions more to acquire and retain the personnel who can build and maintain it. There are several additional major benefits of XML, but they are items for another column. XML allows the development of single source documents which can be rendered using XSL and standard tools to generate HTML, PDF, RTF formats.