Re: [xml] string-range in xpointers from python?

[Daniel Veillard <veillard redhat com>]

On Fri, Aug 18, 2006 at 10:44:30AM -0500, Ross J. Reedstrom wrote:
> O.k, so this is better, some:
> > > > print ctx.xpointerEval('xpointer(/cnx:document/cnx:content/cnx:para[1])')[0].content
>
>       Geometric representation of signals can provide a compact
>       characterization of signals and can simplify analysis of their
>       performance as modulation signals.
>
> > > > ctx.xpointerEval('xpointer(string-range(/cnx:document/cnx:content/cnx:para[1],"Geometric"))')
> Unable to convert XPath object type 7
>
> I see this same error from a list posting a year ago, May. I'm using
> libxml2 2.6.26. Is there more complete support in CVS? Should I be
> getting my devel setup functional, and see about providing a patch or
> two?

  Hum, yeah, that must be the binding missing support from the extra
XPath types (XPATH_POINT, XPATH_RANGE and XPATH_LOCATIONSET), I guess
nobody tried to really use them from Python, you're in unknown land.
  Probably libxml_xmlXPathObjectPtrWrap() should be augmented to 
handle them (python/types.c around line 397), and convert them to Python
type. I don't know what would be the best way to represent a point, 
maybe a tuple made of a node and an index.
  I would be glad to get patches and some example to run the regression tests
from python/test/ !

  Thanks in advance :-)

Daniel

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