Question

The definitions in an XML document are said to be __________ when the tagging system and definitions in the DTD are all in compliance.

Answer 1

extensible

hope it will help you

Answer 2

The definitions in an XML document are said to be valid when the tagging system and definitions in the DTD are all in compliance as in an XML the document adhers to all the general rules such as nesting of the tags and balance of tags.

This is the right way to prove it.