Re: [xml] RFE: support for function here() in XPath

[Daniel Veillard <veillard redhat com>]

On Sat, Mar 09, 2002 at 06:49:41AM -0800, Aleksey Sanin wrote:
> Daniel,
>
> I am working on XMLDSig implementation and I need some help from you.
> A new XPath function here() was introduced by this standard:
>             http://www.w3.org/TR/xmldsig-core/#sec-XPath
> Will it be possible to add this function to libxml2?

  It is there, as part of XPointer, but you need to do a bit of work:
    - you need to register it in your XPath context
          xmlXPathContextPtr ctxt;

          xmlXPathRegisterFunc(ctxt, (xmlChar *)"here",
                               xmlXPtrHereFunction);
    - you need to provide a pointer to the node within the context:
          ctxt->here = here;

Both are done in xmlXPtrNewContext() in xpointer.c f you want to have a look,
the implementation of here() itself is trivial, this should work as is without
need for a patch.

  It's funny for me to see this, for historical reasons based on my previous
work in the W3C XML Linking WG.

Daniel

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