CODEWITHSUNDEEP
htmlxmlxhtmlxsddtd
Lucas
Lucas

Reputation: 6348

Official XHTML 1.1 DTDs vs. official XHTML 1.1 XML Schemas

I have the option of validating XHTML 1.1 documents against the official XHTML 1.1 DTDs (I use the plural because the "main" DTD actually includes several others) or against the official XHTML 1.1 XML Schemas.

Now I know that the XML Schema language is more expressive and powerful and can therefore check for more things. What I'm wondering is whether these "extra" features are actually in use in the official schemas. To put it differently, will validating against these schemas check for more things than validating against these DTDs?

Upvotes: 6

Views: 519

Answers (3)

james.garriss
james.garriss

Reputation: 13397

The XHTML 1.1 pages for the DTD and XML schema both state, "This appendix is normative." That means they should perform identical validation checks.

So to answer your question: No.

Upvotes: 1

tovare
tovare

Reputation: 4087

It's a requirement that anything that validates using the DTD should also validate using the schema.

The conformance definition states that

The document MUST conform to the constraints expressed in Appendix C.

and Appendix C contains the DTDs. Nothing is said about conforming to the schemas which are in Appendix D. Therefore, any extra constraints from the schemas would not be binding, since documents only need to satisfy the DTDs.

(Edited)

Upvotes: 1

2ndkauboy
2ndkauboy

Reputation: 9377

There are many things that you can only express with a schema and than means that validating against a schema will always give you a better response about the validity of your XML file.

Upvotes: 0

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