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Generally speaking, how is an XML document structured?

XSD is written in:

What is XHTML's primary intended use?

Which appear first in a DTD?

What does an XML document have?

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?

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

What is the correct syntax for comments in XQuery?

You are working with an XML document that uses an XML schema. How do you ensure that an attribute must be specified for its corresponding element?

The readyState property holds the status of the XMLHttpRequest. Which is NOT a valid status?