Re: [xml] results from xpath

["Christopher R. Maden" <crism maden org>]

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At 03:39 10/5/04, Nicolas ANTONIAZZI wrote:
> > if you have the appropriate DTD or schema information available.  But now,
> > you don't *copy* those nodes - you retrieve information from them and
> > output it.  xmlElemDump(), as you've discovered, will give you the entire
> > element - not just its start- and end-tags.  Instead, write new elements
> > that share information from the old ones.  (Sorry for no example - I'm 
> more
> > familiar with the Perl XML::LibXML interface than the direct C API.)
>
> I'm not sure to understand your last point.
> Using my previous example, if I get an array with some nodes results :
>
> result array :
> |b|id|c|id|

I assume you mean: the element with name "b", the id attribute of that 
element, the element with name "c", and the id attribute of that element.

Unless there are attributes that you want to leave out of your result tree, 
I would probably just target the elements themselves, and then copy all of 
their attributes.

> Do you suggest me to traverse this array and create a new tree (of new
> nodes) and looking for these elements to know which one is the parent
> (or the child) of another one ?

That would be one way to do it, if you don't have any advance knowledge of 
the relationship between your target elements.  So in pseudocode:

while there are nodes in the list {
   is any other node in list an ancestor of the first node?
     if so, skip this node for now.
   create an output element with the same name as this node and copy the 
attributes over
   remove the node from the list
   start again at the start of the list
}

This is very easy to do in XSLT:

<xsl:template match="*">
   <xsl:apply-templates/>
</xsl:template>

<xsl:template match="text()"/>

<xsl:template match="b[ id='2'] | c[ id='3']">
   <xsl:copy>
     <xsl:copy-of select="@*"/>
     <xsl:apply-templates/>
   </xsl:copy>
</xsl:template>

~Chris
- -- 
Christopher R. Maden, Principal Consultant, crism consulting
XML-SGML-HTML-DTDs-schemas-XSL-DSSSL-conversion-training-ebooks-B2B
<URL: http://crism.maden.org/consulting/ >
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