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RE: RE: XPath predicate test and parameter problem

Subject: RE: RE: XPath predicate test and parameter problem
From: cknell@xxxxxxxxxx
Date: Tue, 30 Sep 2003 13:27:22 -0400
subject and predicate test
Thank you Bryan, Dimitre, and Michael. Did you hear that? It was me administering a dope slap to myself. No, Michael, I wasn't imagining that variables in XPath are macros. I just wasn't thinking too clearly.

-- 
Charles Knell
cknell@xxxxxxxxxx - email



-----Original Message-----
From:     bryan.s.schnabel@xxxxxxxxxxxxxx
Sent:     Tue, 30 Sep 2003 10:09:52 -0700
To:       xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject:  RE:  XPath predicate test and parameter problem

If you remove the single quotes in the predicate, like this,

<xsl:value-of select="row[state=$st]/city" />

you get,

<?xml version="1.0" encoding="UTF-8"?>Milwaukee

-----Original Message-----
From: cknell@xxxxxxxxxx [mailto:cknell@xxxxxxxxxx] 
Sent: Tuesday, September 30, 2003 9:42 AM
To: XSL-List@xxxxxxxxxxxxxxxxxxxxxx
Subject:  XPath predicate test and parameter problem


This is making me crazy. I can't figure out where I'm failing.

Given this data document:
<?xml version="1.0" encoding="UTF-8" ?>
<rowset>
 <row>
  <city>Des Moines</city>
  <state>IA</state>
 </row>
 <row>
  <city>Pittsburgh</city>
  <state>PA</state>
 </row>
 <row>
  <city>Milwaukee</city>
  <state>WI</state>
 </row>
</rowset>

Why does this stylesheet produce the output "Milwaukee",
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="xml" indent="yes" encoding="UTF-8" />

 <xsl:template match="/">
  <xsl:apply-templates select="rowset">
   <xsl:with-param name="st" select="'WI'" />
  </xsl:apply-templates>
 </xsl:template>

 <xsl:template match="rowset">
  <xsl:param name="st" />
  <xsl:value-of select="row[state='WI']/city" />
 </xsl:template>

</xsl:stylesheet>

and this one, only '<?xml version="1.0" encoding="UTF-8" ?>',

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="xml" indent="yes" encoding="UTF-8" />

 <xsl:template match="/">
  <xsl:apply-templates select="rowset">
   <xsl:with-param name="st" select="'WI'" />
  </xsl:apply-templates>
 </xsl:template>

 <xsl:template match="rowset">
  <xsl:param name="st" />
  <xsl:value-of select="row[state='$st']/city" />
 </xsl:template>

</xsl:stylesheet>

To save you the trouble of minutely examining the two, the difference is
that in the one that doesn't work the way I think it should, I use the value
of the parameter to test the content of the "state" element, where in the
one that produces the output I want, I use the literal string 'WI'.

Thanks.


-- 
Charles Knell
cknell@xxxxxxxxxx - email

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