Item 14. Allow All XML Syntax
XML applications should be designed around elements and attributes. You can use a schema or a DTD to constrain which elements and attributes are allowed where and what their legal content is. You may also impose additional constraints that affect the content of the document but cannot be expressed in a schema. For example, you might require that the ID attribute of an Employee element must be the actual ID of a current or past employee. All of these are constraints on the content and structure of the document. They generally reflect the semantics of a particular application domain.
Despite some early hype about search engines that understood web pages because you used a Shoe tag instead of an LI tag (some of which ...
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