Re: [xsl] Fetch a sequence of nodes from input file

At 2009-09-23 18:34 -0400, rowan(_at_)sylvester-bradley(_dot_)org wrote:

Thanks very much for these ideas. I'm trying to use Martin's solution but I
don't understand the line:
<xsl:copy-of select="$si | $si/following-sibling::item[. &lt;&lt;
$si/following-sibling::item[level &lt;= $si/level][1]]"/>

What does &lt;&lt; or << mean?

$a << $b is true when the singleton node in the variable "a" isbefore the singleton node "b" in document order in the same tree.


$a >> $b is true when $a is after $b in document order in the same tree.

$a is $b is true when $a is the same node as $b.

Now I said "in the same tree", but it works it just is implementationdependent when comparing nodes from one tree to another tree. Oneprocessor will have it one way and another processor will have it inanother order. So you will get true/false when comparing documentorder between nodes from different trees, but not necessarily thesame answer when using two different processors on the same tree.


I hope this helps.

. . . . . . . . . Ken

T:\ftemp>type rowan2.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="2.0">

<xsl:output method="text"/>

<xsl:template match="/">
  <xsl:variable name="tree1" as="element(doc)">
    <doc>
      <a/>
      <b/>
    </doc>
  </xsl:variable>
  <xsl:variable name="tree2" as="element(doc)">
    <doc>
      <a/>
      <b/>
    </doc>
  </xsl:variable>

1/a &lt;&lt; 1/b: <xsl:value-of select="$tree1/a &lt;&lt; $tree1/b"/>
1/a >> 1/b: <xsl:value-of select="$tree1/a >> $tree1/b"/>
1/a is 1/a: <xsl:value-of select="$tree1/a is $tree1/a"/>
1/a is 1/b: <xsl:value-of select="$tree1/a is $tree1/b"/>
1/a &lt;&lt; 2/b: <xsl:value-of select="$tree1/a &lt;&lt; $tree2/b"/>
1/a >> 2/b: <xsl:value-of select="$tree1/a >> $tree2/b"/>
</xsl:template>

</xsl:stylesheet>
T:\ftemp>xslt2 rowan2.xsl rowan2.xsl


1/a << 1/b: true
1/a >> 1/b: false
1/a is 1/a: true
1/a is 1/b: false
1/a << 2/b: true
1/a >> 2/b: false
T:\ftemp>



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