Re: [xsl] finding lowest level in ancestor:: axis

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2006-01-26 13:56 -0800, Dan Vint wrote:
> in the link I want to build I need to know the containing division 
> tag which is not always the immediate parent.
> ...
> Instead of finding the first <div2> tag this seems to always locate 
> the highest ancestor in the tree and comes back with the <div1>.

Right ... because although the steps in the location path are 
addressed in proximity order, the set of nodes returned is addressed 
in document order, and generate-id() always acts on the first in 
document order.

> I even changed the order of the select for the variable to be high 
> to low and low to high and nothing changed. I though maybe there 
> might be an evaluation order going on.

There isn't.

> is there another way to do this instead of:

You were very close ... having selected all the ancestors, you know 
the result set is going to be in a direct line from the id() node to 
the root of the tree ... to get the closest, all you need is the last 
of those in document order, so use [last()] on the set.

Below is code that has your code first (returning div1), the addition 
of the predicate second (returning div2), and perhaps an abbreviated 
expression that might be of interest (also returning div2).  Note 
that I changed generate-id() to name() in order to expose to which 
node I am pointing.

Note that your tables won't be numbered until you change your current 
node to the id()'ed node (which I did in the third example).

I hope this helps, Dan.

. . . . . . . . . . . Ken

T:\ftemp>type dan.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE div1
[
  <!ATTLIST table id ID #REQUIRED>
]>
<div1>
     <p>Some text here</p>
     <div2>
           <p>More text <ref idref='t1'/></p>
             <example>
                     <table id='t1'/>
             </example>
     </div2>
</div1>

T:\ftemp>type dan.xsl
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output indent="yes"/>

<xsl:template match="/">
  <xsl:for-each select="//ref">
    <xsl:variable name="parent"
           select="(id(@idref)/ancestor::div10 |
                    id(@idref)/ancestor::div9 |
                    id(@idref)/ancestor::div8 |
                    id(@idref)/ancestor::div7 |
                    id(@idref)/ancestor::div6 |
                    id(@idref)/ancestor::div5 |
                    id(@idref)/ancestor::div4 |
                    id(@idref)/ancestor::div3 |
                    id(@idref)/ancestor::div2 |
                    id(@idref)/ancestor::div1)"/>
     <a href="{concat(name($parent), '.html#', @idref)}">
          Table <xsl:number level="any" from="div1" count="table" format="1"/>
          <xsl:text> </xsl:text>
     </a>
  </xsl:for-each>
  <xsl:for-each select="//ref">
    <xsl:variable name="parent"
           select="(id(@idref)/ancestor::div10 |
                    id(@idref)/ancestor::div9 |
                    id(@idref)/ancestor::div8 |
                    id(@idref)/ancestor::div7 |
                    id(@idref)/ancestor::div6 |
                    id(@idref)/ancestor::div5 |
                    id(@idref)/ancestor::div4 |
                    id(@idref)/ancestor::div3 |
                    id(@idref)/ancestor::div2 |
                    id(@idref)/ancestor::div1)[last()]"/>
     <a href="{concat(name($parent), '.html#', @idref)}">
          Table <xsl:number level="any" from="div1" count="table" format="1"/>
          <xsl:text> </xsl:text>
     </a>
   </xsl:for-each>
  <xsl:for-each select="//ref">
    <xsl:variable name="parent"
           select="(id(@idref)/ancestor::*[starts-with(local-name(),'div')])
                   [last()]"/>
     <a href="{concat(name($parent), '.html#', @idref)}">
       <xsl:for-each select="id(@idref)">
          Table <xsl:number level="any" from="div1" count="table" format="1"/>
          <xsl:text> </xsl:text>
        </xsl:for-each>
     </a>
   </xsl:for-each>
</xsl:template>

</xsl:stylesheet>
T:\ftemp>xslt dan.xml dan.xsl con
<?xml version="1.0" encoding="utf-8"?>
<a href="div1.html#t1">
          Table  </a>
<a href="div2.html#t1">
          Table  </a>
<a href="div2.html#t1">
          Table 1 </a>
T:\ftemp>


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