Re: [xml] Extending XPath?

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From: Daniel Veillard (Daniel.Veillard@w3.org)
Date: Tue Oct 10 2000 - 17:18:32 EDT

On Mon, Oct 09, 2000 at 02:15:25PM +0000, Bjorn Reese wrote:
>
> I had a look at how to implement XPointer in libxml, and I see
> that Daniel has been doing something similar in the latest
> releases, so it may be a good idea to discuss how it is best
> implemented.

  With C code :-) Seriously it's coming soon !

> XPointer uses and extends XPath expressions. It extends both
> the data types and functions. Other standards such as XQL (and
> XSLT?) also uses and extends XPath expressions, although in
> different directions than that of XPointer.
>
> I think that the current XPath implementation is good, but
> difficult to extend. Even if we do not want to implement XQL,
> it should still be possible to implement XQL on top of libxml.
>
> I can think of four feasable solutions for extending XPath
> expressions:
>
> 1) Patch xpath.c directly. This way xpath.c can become very
> difficult to maintain.

  a bit is needed, it's minimal

> 2) Make the parsing and and stack functionality of xpath.c
> public (most of it is currently private macros).

  only a bit was needed

> 3) Inherit from an XPath "class". Although this is not
> conveniently done in C, it is possible to a certain
> degree.

  out of scope, not needed.
> 4) Provide extendibility hooks.

  provided new api and new types.

  FYI I expect to have a complete XPointer implementation around the
end of the week. I didn't ship the xpointer code in 2.2.4 but I will
in 2.2.5

  check xpointer.[ch] from
  http://dev.w3.org/cvsweb/XML/

Daniel
     

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