multiple attributes

problem.

<xsl:param name="wanted" select="''"/>

<element att="a b c d">
wanted, contains both a and b

</element>

<element>

wanted, has no att attribute

</element>

<element att="x">
not wanted, block it.
</element>

I want to run an identity transform, but only 
select those elements which either have no @att,
or have an att value which is one of those passed into the stylesheet
as a command line param, e.g.

saxon file.xml ss.xsl "wanted= a b"

should only copy through those elements having an att value 
which contains one or both of a, b.

Hope that's clear.

I can't recall seeing a mxn contains string thingy.
I'm getting stuck with a recursion solution.
Any help appreciated.

TIA DaveP.



 <xsl:template match="*[(_at_)targets]">
    <xsl:variable name="inTarget">
    <xsl:call-template name="tgt">
      <xsl:with-param name="wanted" select="$targets"/>
      <xsl:with-param name="this-elements-targets" select="@targets"/>
    </xsl:call-template>
  </xsl:variable>
  <xsl:choose>
    <xsl:when test="$inTarget">
       <!-- Copy through, wanted -->
       <xsl:copy>
         <xsl:copy-of select="@*"/>
         <xsl:apply-templates/>
       </xsl:copy>
    </xsl:when>


    <xsl:otherwise/>  <!-- block, not wanted -->
  </xsl:choose>
  </xsl:template>



 <xsl:template name="tgt">
    <xsl:param name="wanted" select="''"/>
    <xsl:param name="this-elements-targets" select="''"/>
    <xsl:if test="$debug">
      <xsl:message>
tgt: wanted   <xsl:value-of select="$wanted"/>
this els:   <xsl:value-of select="$this-elements-targets"/>
      </xsl:message>
    </xsl:if>
<xsl:variable name="onetarget"
select="substring-before($this-elements-targets,'+')"/>
      <xsl:if test="contains($wanted, $onetarget)">
        <xsl:value-of select="true"/>
      </xsl:if>

    <xsl:choose>
      <xsl:when test="string-length($this-elements-targets)= 0">
        <xsl:value-of select="false()"/>
      </xsl:when>
      

      <xsl:otherwise>
        <xsl:call-template name="tgt">
          <xsl:with-param name="this-elements-targets"
select="substring-after($this-elements-targets,'+')"/> <!-- presently uses +
character as seperator. perhaps change to space character -->
          <xsl:with-param name="wanted" select="$wanted"/>
        </xsl:call-template>
      </xsl:otherwise>
    </xsl:choose>


  </xsl:template>


Regards DaveP.

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