In general, CLP-ML produced smaller documents than CDA markup (Table 1) because specific markup
allows section and subsection titles to be omitted from the source document and inserted for display by stylesheets.
There was, therefore, no set and specific markup
on pharmaceuticals being sold by the defendants.
Because of inherent limitations of DTDs, there is great interest in a more effective technique called "XML Schemas", another W3C standard, which defines the specific markup
that is valid within an XML document.
Use specific markup to describe your content, so you can apply presentation styles intelligently, mine information for later reuse, and allow intelligent online search.
Once you have your specific markup, you still have to develop those intelligent applications and data mining tools that take advantage of your markup.
So despite the promise, many people using XML or SGML for documentation simply pick a general DTD, use existing tools, and forget about the promise of specific markup.
Appendix I: Deprecated and Browser - Specific Markup
He explains the nature of markup by defining "good markup" and making a distinction between generic and specific markup