Re: How to compare the attributes of two elements to e

> What is the best way to compare two elements in terms of their
> attributes, and the attribute values? I need to ensure that each
> element has the same number of attributes, the same attribute names and
> the same attribute values.

Here's a simple way to do this (the separators must be well chosen not to be
a substring of the values of the attributes):

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text"/>

  <xsl:template match="x">
    attributeEq(t, u) = <xsl:text/>
    <xsl:call-template name="compAttributes">
      <xsl:with-param name="pAtt1" select="t/@*"/>
      <xsl:with-param name="pAtt2" select="u/@*"/>
    </xsl:call-template>

    attributeEq(t, v) = <xsl:text/>
    <xsl:call-template name="compAttributes">
      <xsl:with-param name="pAtt1" select="t/@*"/>
      <xsl:with-param name="pAtt2" select="v/@*"/>
    </xsl:call-template>
  </xsl:template>

  <xsl:template name="compAttributes">
    <xsl:param name="pAtt1" select="/.."/>
    <xsl:param name="pAtt2" select="/.."/>

    <xsl:choose>
      <xsl:when test="count($pAtt1) = count($pAtt2)">
        <xsl:variable name="v1">
          <xsl:for-each select="$pAtt1">
            <xsl:sort select="name()"/>
            <xsl:value-of
              select="concat('N', name(), 'N', 'V', ., 'V')"/>
          </xsl:for-each>
        </xsl:variable>

        <xsl:variable name="v2">
          <xsl:for-each select="$pAtt2">
            <xsl:sort select="name()"/>
            <xsl:value-of
              select="concat('N', name(), 'N', 'V', ., 'V')"/>
          </xsl:for-each>
        </xsl:variable>

        <xsl:value-of select="number($v1 = $v2)"/>

      </xsl:when>
      <xsl:otherwise>0</xsl:otherwise>
    </xsl:choose>
  </xsl:template>
</xsl:stylesheet>

When this thransformation is applied on the following source.xml:

<x>
  <t a="xxx" b="yyy" c="zzz"/>
  <u b="xxxT" a="yyy" c="zzz"/>
  <v c="zzz" b="yyy" a="xxx"/>
</x>

the correct result is produced:

    attributeEq(t, u) = 0

    attributeEq(t, v) = 1



=====
Cheers,

Dimitre Novatchev.
http://fxsl.sourceforge.net/ -- the home of FXSL




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