Re: [xsl] Complex XPath Help

[Joerg Heinicke <joerg dot heinicke at gmx dot de>]

Hi Mike,

what exactly is your problem? What's the stylesheet for your easier 
structure? For the complex one easily use preceding-axis.

An example:

<xsl:template match="tab">
     <xsl:text>preceding page:</xsl:text>
     <xsl:value-of select="preceding::tab/@page"/>
     <xsl:text>current page:</xsl:text>
     <xsl:value-of select="@page"/>
     <xsl:text>next page:</xsl:text>
     <xsl:value-of select="following::tab/@page"/>
</xsl:template>

Regards,

Joerg

Peet, Mike wrote:
> Okay, it's probably not *that* complicated, but I'm having some trouble with
> this one.  I think I'm missing something fundamental.  Sorry for the long
> message.  For those of you that have the patience to look at this, your help
> is greatly appreciated.
> 
> <xml>
>    <tab-groups>
>       <tab-group id="100" name="group1">
>          <tabs>
>             <tab desc="Page 1" page="page1.asp"/>
>             <tab desc="Page 2" page="page2.asp"/>
>          </tabs>
>       </tab-group>
>       <tab-group id="104" name="group2">
>          <tabs>
>             <tab desc="Page x" page="pagex.asp"/>
>             <tab desc="Page y" page="pagey.asp"/>
>          </tabs>
>          <tab-group id="145" name="group3">
>             <tabs>
>                <tab desc="Page A" page="pageA.asp"/>
>                <tab desc="Page B" page="pageB.asp"/>
>             </tabs>
>          </tab-group>
>          <tab-group id="167" name="group3">
>             <tabs>
>                <tab desc="Page A" page="pageA.asp"/>
>                <tab desc="Page B" page="pageB.asp"/>
>             </tabs>
>          </tab-group>
>       </tab-group>
>    </tab-groups>
> </xml>
> 
> With the above XML document, if I pass a "page" into the XSLT as a
> parameter, and I want to know what the previous and next pages are, how
> would that be done?  Note that the tab-groups may be nested.
> 
> The desired behaviour is that the previous page would be simply the page
> attribute of the preceding <tab> element (in document order, regardless of
> group), and next would be the page attribute of the following <tab> element
> (in document order, regardless of group).  The special cases of first and
> last pages can return nothing.
> 
> One way that I can think of is an intermediate transform to get a document
> containing just the <tab> elements with no nesting, and using the
> preceding-sibling and following-sibling axes off the current tab, like this:
> 
> <xml>
>    <tabs>
>       <tab group-id="100" desc="Page 1" page="page1.asp"/>
>       <tab group-id="100" desc="Page 2" page="page2.asp"/>
>       <tab group-id="104" desc="Page x" page="pagex.asp"/>
>       <tab group-id="104" desc="Page y" page="pagey.asp"/>
>       <tab group-id="145" desc="Page A" page="pageA.asp"/>
>       <tab group-id="145" desc="Page B" page="pageB.asp"/>
>       <tab group-id="167" desc="Page A" page="pageA.asp"/>
>       <tab group-id="167" desc="Page B" page="pageB.asp"/>
>    </tabs>
> </xml>
> 
> But this seems to defeat the purpose of a having a nice structured XML
> document in the first place.  I would like to be able to accomplish this
> without another transform, but I cannot seem to come up with the correct
> XPath.. :(
> 
> Well, back to the XSL; thanks in advance!
> 
> Michael Peet
> Software Engineer
> Choice One Communications
> 100 Chestnut Street, Suite 600
> Rochester, NY 14604
> mpeet@choiceonecom.com
> (585) 530-2773


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