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Re: [xsl] Subject: Counting Path Occurrences

2007-04-03 19:24:23
Michael Kay wrote:
Scott Coon wrote:
So, start with a stylesheet function to generate the paths 
(/a/b/x) using the ancestor-or-self axis:

<xsl:function name="gn:path">
    <xsl:param name="node" as="node()"/>
    <xsl:for-each select="$node">
            <xsl:for-each select="ancestor-or-self::*"><xsl:value-of
select="concat('/', name())"/></xsl:for-each>
    </xsl:for-each>
</xsl:function>

Actually that function generates a sequence of text nodes.

That was the original source of my confusion.  :)  Is that because of
the "for-each" over the ancestor-or-self axis?  


My hope was to use it like this in the template that matches "/":

<xsl:for-each-group select="descendant-or-self::*"
group-by="gn:path(.)">
    Path: <xsl:value-of select="gn:path(.)"/> - Count: 
<xsl:value-of select="count(current-group())"/>
</xsl:for-each-group>

Unfortunately, stylesheet functions only return item()*, not 
string,

Stylesheet functions return whatever you choose them to return. The
simplest
way to return the string you want is

<xsl:function name="gn:path" as="xs:string">
  <xsl:param name="node" as="node()"/>
  <xsl:sequence select="concat('/',
string-join(ancestor-or-self::*/name(),
'/'))"/>
</xsl:function>


I want to make sure I understand this:  is the "xsl:sequence" operation
constructing a sequence that contains the results of the "select"
attribute?  And does that result in a single text node because of the
concat?  And is that enforced at runtime by the "as" attribute in your
function declaration?

Thanks,
Scott 

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