DTD generation from XML Schema

[Rob Exley]

I think this is a sensible question but am happy to be pointed out the error of my ways.

I am specifying a new product for which I would like to have an XML Schema interface (not sure whether W3C or Relax NG as yet). I would also like to have a DTD that describes the same interface for those clients who are unable to use Schemas for one reason or another. Is it possible to generate a DTD from a given Schema ? I can seem to find lots of things about specific tools generating DTD's and Schemas from a given XML document.

However logically I would like to maintain one schema for which I can then generate an equally valid DTD and also example XML documents.

BTW: I would ideally like this to be possible from either command line such that it can be hooked into the build process or from some kind of Emacs mode ?

Appreciate any help in advance.....

 

[Martin Honnen]

I think this is a sensible question but am happy to be pointed out the error of my ways.

I am specifying a new product for which I would like to have an XML Schema interface (not sure whether W3C or Relax NG as yet). I would also like to have a DTD that describes the same interface for those clients who are unable to use Schemas for one reason or another. Is it possible to generate a DTD from a given Schema ? I can seem to find lots of things about specific tools generating DTD's and Schemas from a given XML document.

However logically I would like to maintain one schema for which I can then generate an equally valid DTD and also example XML documents.

I am not going to say that it is not solvable but at least a W3C XML schema can specify/constrain a lot of things a DTD can't do, for instance if you use some regular expression pattern to restrict the value of an element or attribute how would you want to express that in a DTD?

 

[Rob Exley]

I am not going to say that it is not solvable but at least a W3C XML schema can specify/constrain a lot of things a DTD can't do, for instance if you use some regular expression pattern to restrict the value of an element or attribute how would you want to express that in a DTD?

I am happy to lose validation information that I have no way to specify in the DTD as long as the structure and relationships cardinality etc are maintained. I appreciate that using schemas I can provide a lot better validation for any documents using the schema.