DomDocumentType in PHP 5

Hello, I'm trying to make use of the getElementById DOM function, but as pointed out in bug #26813 this won't work unless an attribute is explicitely defined in an associated DOCTYPE. This is fine, but I can't seem to find any relevent examples that show how to apply a DOCTYPE to a DomDocument. The class DomDocumentType seems like a good starting point, but I don't see how that interfaces with DomDocument. So here's what I want to do: 1. Create a new DomDocument 2. Associate this with a DomDocumentType somehow 3. Build an XML structure using the DOM 4. Query this structure using getElementById Sorry if I'm missing something obvious. Also, is there a better list/newsgroup for this? Thanks, -Dan