Thread: Writing to DTD Document

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http://www.java-forums.org/xml/52349-writing-dtd-document.html

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Consider using oracle.xml.parser.v2.NodeFactory

NodeFactory (Oracle® XML Java API Reference)

PS. Sorry, on further inspection, it appears that the APIs treat the DTD as read only, and you can only create non-DTD nodes through the NodeFactory!

DTD class gives you the methods to read your DTD. You will have to serially construct your merged DTD because there is no way to update that part of the DOM model through the API, by the looks of things. It is not that difficult though is it? Just concatenate the serialized representations of the nodes in the correct order and print them to a PrintStream?

Just found this which confirms what I posted above..

Interface DocumentType

Each Document has a doctype attribute whose value is either null or a DocumentType object. The DocumentType interface in the DOM Core provides an interface to the list of entities that are defined for the document, and little else because the effect of namespaces and the various XML schema efforts on DTD representation are not clearly understood as of this writing.

DOM Level 3 doesn't support editing DocumentType nodes. DocumentType nodes are read-only.

Document Object Model Core

So there you go. The latest DOM Model does not support editing the DTD through the model. You will have to construct it serially and print it out to your own PrintStream. :-)