Re: [xml] Xpath Question

2008-10-21 Thread Martin Trappel 

Alistair Leslie-Hughes wrote:

Hi,

I have the following XML
?xml version=\1.0\ encoding=\utf-8\?\r\nstringC4TJXQFL/string

and using msxml I can do selectSingleNode(string) to select the root 
node.


Is there an xmlXPath or equivalent function?  (assume that I cannot 
change the string parameter)




xmlDocPtr doc;
...
xpctxt = xmlXPathNewContext(doc);
xpobj = xmlXPathEvalExpression(/string, xpctxt);
if(xpobj-nodesetval-nodeNr)
  xmlNodePtr string_root_node = nodeSet-nodeTab[0];
...

(error checks and freeing stuff omitted.)

br,
Martin
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Re: [xml] Xpath question

2008-06-03 Thread Daniel Veillard 
On Mon, Jun 02, 2008 at 06:20:07PM -0700, Yong Chen (yongche) wrote:
 
 Hi,
 
 Got a question regarding xpath usage in libxml2.
 
 If I have a document doc, which contains some nodes, say n1, n2, n3.
 
 Now I have an xpath as:  /bookstore/book[1]/title
 
 Do we have any api that can evaluate node n1 and tell me that if we
 were to apply this xpath string to the document, then n1 would be
 selected (or not).
 
 Basically I want to evaluate an xpath on node basis, not the full
 document basis.

  The closest is the patter module, but that works only on a subset
of XPath

   http://xmlsoft.org/html/libxml-pattern.html

you will have to look at the code in XPath/Schemas to get an idea on how
to use it, as there isn't much documentation.

Daniel

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Re: [xml] Xpath question

2007-04-25 Thread Liam R E Quin 
On Wed, 2007-04-25 at 16:32 -0700, Yong Chen (yongche) wrote:

 Say I have an xml tree:
 
 
A
 
B C
 
  D   E
 
[..]

 Now say I have xpath /A/B, it selects node B. When I return the
 result, should I return B node only, or I should return B and also its
 child (D and E)?

You return the whole subtree.

Assuming you is an XPath implementation.

This list is really for the Gnome XML library, which already implements
XPath.

Liam


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Re: [xml] Xpath question

2007-01-12 Thread Daniel Veillard 
On Thu, Jan 11, 2007 at 07:05:36PM -0800, Yong Chen (yongche) wrote:
 
 Thanks Daniel. I did some tests for xmlSaveTree, it basically prints out
 the selected nodes and their children.
 
 Is there any way to print out the selected nodes and their parents (till
 root)?

 To me it makes very little sense to not print the children of a node,
so that would mean printing the document, which is already possible.

 I can certainly do the traversal via node-parent. Just in case
 you already have some API available (which will trim the non-selected
 nodes from the original doc and do xmlDocDump(stdout, doc)).

  No such API, just walk the tree.

Daniel

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Re: [xml] Xpath question

2007-01-11 Thread Daniel Veillard 
On Wed, Jan 10, 2007 at 05:57:37PM -0800, Yong Chen (yongche) wrote:
  
 Hi,
 
 I plan to use xpath in libxml2 to get a subset of a xmldoc, I know it
 can be done by calling xmlXPathEvalExpression(), the result is a
 xmlXPathObjectPtr which has a nodesetval member pointing to selected
 nodes (of type xmlNodeSetPtr).
 
 My question is, after getting the selected nodes, is there any API I can
 call to dump the selected nodes in xml tree format? There is a
 convenient API xmlDocDump(stdout, doc) to dump the whole doc in xml tree
 format, I'm looking for something like xmlDocDumpSubset(doc,
 selected-nodes) to dump only the selected nodes in the doc.

  See http://xmlsoft.org/html/libxml-xmlsave.html#xmlSaveTree

Daniel

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Re: [xml] Xpath question

2007-01-11 Thread Yong Chen (yongche) 

Thanks Daniel. I did some tests for xmlSaveTree, it basically prints out
the selected nodes and their children.

Is there any way to print out the selected nodes and their parents (till
root)? I can certainly do the traversal via node-parent. Just in case
you already have some API available (which will trim the non-selected
nodes from the original doc and do xmlDocDump(stdout, doc)).

Thanks,
Yong Chen

 -Original Message-
 From: Daniel Veillard [mailto:[EMAIL PROTECTED] 
 Sent: Thursday, January 11, 2007 2:07 AM
 To: Yong Chen (yongche)
 Cc: xml@gnome.org
 Subject: Re: [xml] Xpath question
 
 On Wed, Jan 10, 2007 at 05:57:37PM -0800, Yong Chen (yongche) wrote:
   
  Hi,
  
  I plan to use xpath in libxml2 to get a subset of a xmldoc, 
 I know it 
  can be done by calling xmlXPathEvalExpression(), the result is a 
  xmlXPathObjectPtr which has a nodesetval member pointing 
 to selected 
  nodes (of type xmlNodeSetPtr).
  
  My question is, after getting the selected nodes, is there 
 any API I 
  can call to dump the selected nodes in xml tree format? There is a 
  convenient API xmlDocDump(stdout, doc) to dump the whole doc in xml 
  tree format, I'm looking for something like xmlDocDumpSubset(doc,
  selected-nodes) to dump only the selected nodes in the doc.
 
   See http://xmlsoft.org/html/libxml-xmlsave.html#xmlSaveTree
 
 Daniel
 
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