Same as before but with a root node 'model':


****** Sample XML *******
<model>
  <source id=3D"VWX" description=3D"This is VWX"/>
  <source id=3D"WXY" description=3D"This is WXY"/>
  <source id=3D"XYZ" description=3D"This is XYZ"/>
  <reqt id=3D"VWX-01" description=3D"This is a requirement identified
within
  source VWX"/>
  <reqt id=3D"XYZ-01" description=3D"This is a requirement identified
within
  source XYZ"/>
  <reqt id=3D"XYZ-02" description=3D"This is another requirement identified

  within source XYZ"/>
  <package name =3D "pkg01">
    <class name=3D"ABC">
      <source-assoc source=3D"XYZ"/>
    </class>
    <class name=3D"BCD">
      <reqt-assoc reqt=3D"XYZ-01"/>
    </class>
    <class name=3D"CDE">
      <source-assoc source=3D"XYZ"/>
      <reqt-assoc reqt=3D"XYZ-01"/>
      <reqt-assoc reqt=3D"XYZ-02"/>
    </class>
    <class name=3D"DEF">
      <reqt-assoc reqt=3D"VWX-01"/>
    </class>
    <class name=3D"EFG">
      <reqt-assoc reqt=3D"XYZ-02"/>
    </class>
    <class name=3D"FGH">
      <source-assoc source=3D"WXY"/>
    </class>
  </package>
</model>
*****************************


I want to count the number of classes that reference a set of sources,
e=2Eg., "XYZ and VWX", via <source-assoc/> or <reqt-assoc/> tags
****** Desired output for XYZ and VWX *******
5
*****************************


My approach is to:
1) construct a variable with all source document id's concatenated and
delimited by '*', e.g.,
  <xsl:variable name=3D"source-ids">*VWX*WXY*XYZ=AD*</xsl:variable>


2) for each class, construct a variable by iterating through the
classes and adding a character, e.g., 'X',
   every time I find a one with an appropriate <source-assoc> or
<reqt-assoc/> tag, e.g.,
  <xsl:variable name=3D"related-classes">
     <xsl:for-each select=3D"package/class">
         <


xsl:if test=3D".//source-assoc[contains=AD($source-ids, '*' +
@source + '*')] | .//reqt-assoc[contains($source=AD-ids, '*' +
substring-before(@reqt, '-') + '*')]">X</xsl:if>
     </xsl:for-each>
  </xsl


:variable>
  NOTE: I want to include the delimiter in the contains function
parameter to ensure that the match is not based on a substring within a

source id
  NOTE: The <source-assoc/> and <reqt-assoc/> tags might actually also
be included within elements contained within classes.

3) display string-length($related-classes=AD)


Problem: I don't believe "'*' + @source + '*'" is being processed
correctly within the contains function.