Re: [xml] DTD Mania

[Daniel Veillard <veillard redhat com>]

On Wed, May 09, 2001 at 05:40:29PM -0400, David Allen wrote:
> Hello,
>
> A few questions about DTDs in documents parsed via
> xmlParseDocument()...
>
> - What's the difference between the internal subset and the external
>   subset?  Just doing some simple checks, it seems doc->intSubset is
>   always non-null and doc->extSubset is always NULL.  Then again, I'm
>   only working with documents that either have <!DOCTYPE foobar SYSTEM
>   "somedtd.dtd"> and <!DOCTYPE foobar PUBLIC "blah" "baz.dtd">

   Definition of internal and extrnal subset are in the XML specification
   http://www.w3.org/TR/REC-xml#dt-doctype
   read the code in entity.c to see use of both when available.

> - Say I'm dealing with "baz.xml" and "foobar.dtd".  I encounter the
>   "blargens" tag, how can I look into the DTD structure to get a list
>   of tags which are valid children of "blargens"?  I'm not looking at
>   rewriting the validation, but getting a list of what's valid in
>   certain contexts for creating XML documents from nothing according
>   to the rules of validity.

   This is defined in the valid.c module:
     http://xmlsoft.org/html/libxml-valid.html#XMLVALIDGETVALIDELEMENTS
     xmlValidGetValidElements ()

Daniel

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