Re: [xml] Creating a DTD from a plain text buffer?

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From: Daniel Veillard (Daniel.Veillard@w3.org)
Date: Mon Oct 30 2000 - 11:45:22 EST

On Mon, Oct 30, 2000 at 11:26:48AM -0500, Harry Blundell wrote:
>
> Okay, I've found the reason that I wasn't getting the <!DOCTYPE ... >
> written to the file when I called xmlSaveFile - as well as setting
> docPtr->intSubset = dtdPtr, I also needed to set
>
> docPtr->children = (xmlNodePtr) dtdPtr;
> docPtr->last = (xmlNodePtr) dtdPtr;
>
> so that the DTD is a child of the document.
>
> I haven't looked into why I'm getting the Bus Error, but I've found a new
> problem (at least it is for me):
>
> Daniel, in the new xmlIOParseDTD you provided, you call
>
> xmlNewDtd(ctxt->myDoc, BAD_CAST "none", BAD_CAST "none", BAD_CAST
> "none");
>
> What's the purpose of the "none" for the ExternalID and SystemID?
> When I attach the DTD to a document as an internal subset, and call
> xmlValidateDocument on it, it fails because it can't resolve the external
> entity "none". Similarly, when I call xmlSaveFile, I get the line
>
> <!DOCTYPE result PUBLIC "none" "none" [
>
> I can work around it by setting
>
> dtdPtr->ExternalID = NULL;
> dtdPtr->SystemID = NULL;
>
> after the call to xmlIOParseDTD, but is the "none" necessary for another
> purpose?

  Well simply that a memory buffer has:
    - no ExternalID
    - no SystemID
 and you asked me to be able to use it without refering to a file.
So it simply can't have those !
 Now if you want to have them loadable dynamically save them to a file
and use the existing interface. Of course xmlValidateDocument fails
because you attach this DTd to the document like if it was part of
it while it's not. To validate a document against a xmlDtdPtr use
xmlValidateDtd() not xmlValidateDocument().
  At that point I'm very tempted to simply not include xmlIOParseDTD()
and ask you to save your DTd to a file. Seems to raise more problems
than to fix any.

Daniel 

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