I am somewhat new to using XML, and have a question regarding DTD (or schema) usage. I am working on a document that has logical 2 parts. I would like the 2 parts to be controlled by 2 different DTDs. Is it possible construct an XML document that would work this way, ie, do the rules of XML allow for multiple DTD/schema to control one document (as long as they don't overlap, as you could have with using both an internal and externa DTD? Basically, we're creating stringent rules for the 1st part of the document that we are going to control. For example, no internal DTDs will be allowed for security reasons. The 2nd part of the document is more freeform and we'd allow either internal or external DTD, I think. Or schema.
Just trying to figure out a reasonable way to do this. Like I said I'm relatively new to this, so there may be something obvious that I'm missing. Thanks for any direction you might be able to provide.