Re: [xml] setting URL for xmlRelaxNGParserCtxt?

[Daniel Veillard <veillard redhat com>]

On Tue, Jan 25, 2005 at 08:14:22PM +0100, Martijn Faassen wrote:
> Hi there,
> 
> In my lxml Python binding for libxml2, I was using the following 
> approach to construct a Relax NG schemas:
> 
> xmlDocPtr* doc = ...
> parser_ctxt = xmlRelaxNGNewDocParserCtxt(doc)
> 
> unfortunately, this got me into trouble with Relax NG schemas that use 
> the 'include' statement. They try to load the files to be included, but 
> have no idea where to look, as this information is lost.
> 
> Glancing through the source, it seems like the only way to make the 
> 'include' statement work is to use xmlRelaxNGNewParserCtxt, which takes 
> a URL.

   Wrong. How did you built "doc" ?  If it's from a memory string you can
still define the base for that document by providing the URL argument
of xmlReadMemory().

> Would it be useful to have a way to supply this URL to an existing 
> xmlRelaxNGParserCtxtPtr? Something like:

  no the base has to be set in the document. Since that part is just
described by '...' in your mail there is little more indications I can
provide.

> void xmlRelaxNGSetURL(xmlRelaxNGNParserCtxtPtr* ctxt, const char* URL)

  The base is a property of the document, not of the relax-NG transformation
compilation, this is really the wrong approach.

> I imagine the same issues come up when using XSLT that tries to include 
> or import external stylesheets.

  yes the base is *in* the document.
  xmlNodeSetBase(xmlNodePtr cur, const xmlChar* uri)
to be called on your document. But it should really be there as the result
of parsing.

Daniel

-- 
Daniel Veillard      | Red Hat Desktop team http://redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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