Re: [xsl] Iterating over all the Ancestors

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Bix (and everyone),

Reading my own post, I realized I might have been confusing. The for-each 
walks all the elements up to the root, but it doesn't "walk up the tree". 
Rather, it selects these elements into a node-set (which, as David C. will 
remind us, has no implicit order) and walks them. By default, in document 
order, so even if the axis goes "up" the tree, the iteration goes "down".

I wouldn't bother to mention it except that (especially given that ancestor 
and ancestor-or-self are among the "reverse" axes) it's sometimes a source 
of gotchas.

Cheers,
Wendell

At 01:47 PM 11/26/2002, I wrote:
> Bix,
>
> Walking up the tree is easy:
>
> <xsl:for-each select="ancestor::*">
>
> walks all the elements up to the root (but not including it: it's not an 
> element). You can include the context node itself by using the 
> ancestor-or-self:: axix.
>
> So in your case
>
> <xsl:template match="data">
>   <xsl:for-each select="ancestor-or-self::*">
>     <xsl:if test="ancestor::*">
>       <!-- if the ancestor element has an ancestor element, it's not
>            first: prepend it with some formatting -->
>       <xsl:text>  ->  </xsl:text>
>     </xsl:if>
>     <xsl:value-of select="text"/>
>     <!-- reports the value of the <text> element child, which is our 
> label -->
>   </xsl:for-each>
> </xsl:template>
>
> By default, a for-each traverses in document order, so this will go 
> top-down. (There are ways to tweak it if you want something different.)
>
> I hope this helps,
> Wendell
>
> At 01:19 PM 11/26/2002, you wrote:
> >   I have been trying to figure out a way of iterating over the parent 
> > nodes of a particular child all the way to the root of the tree.
> > Essentially, I'd like to display the path which I have taken to get to 
> > the current child, but I would like to do it in such a way that at a 
> > future point in time, I can modify my style sheet to include hyperlinks 
> > at each parent node.  An example xml file would be:
> >
> > <data><text>Title for web page</text>
> >    <data><text>Motivation</text>
> >        <data><text>White Pages</text></data>
> >        <data><text>References</text></data>
> >    </data>
> >    <data><text>Requirements</text>
> >        <data><text>Software</text></data>
> >        <data><text>Hardware</text></data>
> >    </data>
> >    <data><text>Design</text>
> >        <data><text>Interfaces</text>
> >            <data><text>Hardware-Software</text></data>
> >            <data><text>Legacy Software</text></data>
> >        </data>
> >        <data><text>Functions</text></data>
> >    </data>
> >    <data><text>Implementation</text></data>
> >    <data><text>Verification</text></data>
> >    <data><text>Documentation</text></data>
> >    <data><text>Archive</text></data>
> > </data>
> >
> > Suppose that we are at the following X-Path:
> >    /<root data>/<Design data>/<Interfaces data>/<Hardware-Software data>
> >
> > I would like to develop a template that essentially displays the path 
> > above in the following way:
> >
> >    Title for web page  ->  Design  ->  Interfaces  ->  Hardware-Software
> >
> > At each point, if I added a <href> node within the xml tree as a child of 
> > the <data> element, then I would like to be able to hyperlink each 
> > individual node...
> >
> > Thanks!
> > Bix
>
>
> ======================================================================
> Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
> Mulberry Technologies, Inc.                http://www.mulberrytech.com
> 17 West Jefferson Street                    Direct Phone: 301/315-9635
> Suite 207                                          Phone: 301/315-9631
> Rockville, MD  20850                                 Fax: 301/315-8285
> ----------------------------------------------------------------------
>   Mulberry Technologies: A Consultancy Specializing in SGML and XML
> ======================================================================
>
>
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======================================================================
Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
----------------------------------------------------------------------
  Mulberry Technologies: A Consultancy Specializing in SGML and XML
======================================================================


XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list