Which DOM node type may NOT have the EntityReference node type as one of its child nodes?

XHTML modules can be extended by adding elements, attributes, modifying content models, or some combination of these. What does a proper implementation of an XHTML module require?

The element is used to replace a namespace in the style sheet with a different namespace in the output. Which XSLT element needs to be its parent node?

XML is a markup language, not a programming language. What makes XML not qualify to be a programming language?

An XML document contains this code as part of the DTD: . What are the rules that need to be followed for each of the elements?

What does the Document Type Definition (DTD) define?

Generally speaking, how is an XML document structured?

<!-- is the start of...

In a DTD, what is the difference between CDATA and PCDATA?

What is 'xmllint'?

DTD includes the specifications about the markup that can be used within the document, the specifications consists of all EXCEPT: