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RE: [xsl] How to select specific nodes using xsl:template match or similar?

2007-06-12 04:25:30
You can rewrite this:

    <xsl:for-each select="data">
      <xsl:variable name="date" select="@name"/>
      <xsl:if test="$date &gt;= $startDate and $date &lt;= $endDate">
        <xsl:value-of select="$date"/>
      </xsl:if>
    </xsl:for-each>

as this:

    <xsl:for-each select="data[(_at_)name &gt;= $startDate and @name &lt;=
$endDate]">
        <xsl:value-of select="@name"/>
    </xsl:for-each>

or as

    <xsl:apply-templates select="data[(_at_)name &gt;= $startDate and @name 
&lt;=
$endDate]"/>

<xsl:template match="data">
  <xsl:value-of select="@name"/>
</xsl:template>

or even as

    <xsl:apply-templates select="data"/>

<xsl:template match="data[(_at_)name &gt;= $startDate and @name &lt;= 
$endDate]">
  <xsl:value-of select="@name"/>
</xsl:template>

(but this last one can't be used with a conformant 1.0 processor - variables
are not allowed in a match pattern).

Don't expect any significant differences in performance (it might be that
one processor does one of these better than the others, but another
processor might do the opposite).

I am trying to use xsl:for-each-group 
method for the first time in an XSL and tried running it 
using Xalan 

Xalan is an XSLT 1.0 processor. You need a 2.0 processor such as Saxon.

Michael Kay
http://www.saxonica.com/



-----Original Message-----
From: Bhaskar Venkateswaran [mailto:bhaskarji(_at_)hotmail(_dot_)com] 
Sent: 12 June 2007 12:07
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] How to select specific nodes using 
xsl:template match or similar?

Hi,

I tried posting twice before but couldn't get the code 
inserted - sorry about that.

Here's is a snippet of an XML I have:

<?xml version="1.0"?>
<rep>
  <data name = "20050102">
    <data name = "AAA">
    </data>
    <data name = "BBB">
    </data>
  </data>
  <data name = "20050103">
    <data name = "AAA">
    </data>
  </data>
  <data name = "20050104">
    <data name = "BBB">
    </data>
    <data name = "CCC">
    </data>
  </data>
</rep>

My objective is to choose all first-level data nodes (i.e, 
nodes with names 20050102, 20050103 & 20050104 above) within 
a specified range of dates. In other words, what is the best 
way to, say, choose only the nodes whose name-value is 
between 20050102 and 20050103 (both inclusive). I want to be 
able to choose such nodes at the top-level WITHOUT using a 
for-each loop. 
That is, I don't want to do something like this because here 
I am running through all nodes that meet my condition as 
opposed to just selecting all such nodes in one query:

  <xsl:variable name="startDate">20050102</xsl:param>
  <xsl:variable name="endDate">20050103</xsl:param>
  <xsl:template match="rep">
    <xsl:for-each select="data">
      <xsl:variable name="date" select="@name"/>
      <xsl:if test="$date &gt;= $startDate and $date &lt;= $endDate">
        <xsl:value-of select="$date"/>
      </xsl:if>
    </xsl:for-each>
</xsl:template>

Hope I am clear. Any help/idea is much appreciated.

Another question: I am trying to use xsl:for-each-group 
method for the first time in an XSL and tried running it 
using Xalan (C version 1.10.0) with Xerces (C version 2.7.0) 
but I get the following warning:

XSLT Warning: The element xsl:for-each-group is an unknown 
XSLT element. 
(sample.xsl, line 34, column 71.)

Does it mean I need to upgrade?

Thanks,
Bhaskar

_________________________________________________________________
Career Aptitude Test. Based on the most scientific MBT Test. 
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