Fw: [xml] filtering a resulting NodeSet with xPath?

[Agustín Villena <avillena tutopia com>]

It seems that I failed to obtain any attention from the xml gurus... The I 
must try again.

My doubt is :
- I don't undestand how libxslt implements its capacity of apply a xpath's 
query over a nodeset (even if this last is a result of another nodeset), 
since don't exists any API (in xpath.c) that allows to do so.
   Does the gurus have any pointer to a way to implement this functionality 
without using an XSLT transformation? Mabye ...

xmlNodeSetPtr nodeSet = evalXpath(doc,"//a");
xmlNodeSetPtr refinedNodeSet = evalXpath(nodeSet,"[ id='3']");

Thank for any help

Agustin

----- Original Message ----- 
From: "Agustín Villena" <avillena tutopia com>
To: <>
Sent: Monday, November 22, 2004 9:51 AM
Subject: [xml] filtering a resulting NodeSet with xPath?


> Hi!
>    I need to implement in a fast way the functionality of filter a nodeset 
> (obtained applying an xPath to an XML), hopefully aplying a new xPath.
> The xPath API only applies to and xmlDocPtr, not to and xmlNodeSetPtr...
> The XMLs that i need to filter has as many as 100.000 nodes, therefore 
> performence is a must!
>
> Example
>
> <root>
> <elem id="0">1<elem>
> <elem id="1">0<elem>
> <elem id="0">0<elem>
> </root>
>
> First filter
> /root/elem[ id="0"]
>
> expected result:
> <elem id="0">1<elem>
> <elem id="0">0<elem>
>
> Second filter
> [.="1"]
> <elem id="0">1<elem>
>
>
> This is equivalent  to make an XSL that saves the first nodeset in a 
> variable (named for example "result") and apply
> exsl:node-set($result)[.="1"]
>
> Any advice?
>  Agustin
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