XSLT novice request?

I am trying to extract an attribute value from a child element where the attribute values from its parent match an attribute value of a distant sibling. The value in the child element is a file path/name. The attributes in the other elements are identifiers. The end result needs to be an html file.

Here are the pertinent bits from the xml file:

<manifest identifier="CMD_0551402_M" version="1.0">
  <organizations>
    <organization identifier="CMD_0551403">
      <item identifier="CMD_0551405">
        <title>Lecture Notes</title>
        <item identifier="CMD_0551406" identifierref="CMD_0551407">
          <title>Lecture 1</title>
        </item>
        <item identifier="CMD_0551409" identifierref="CMD_0551410">
          <title>Lecture 2</title>
        </item>
      </item>
    </organization>
  </organizations>

  <resources>
    <resource identifier="CMD_0551404">
      <file href="properties_CMD_0551403.xml"/>
    </resource>
    <resource identifier="CMD_0551407">
      <file href="lecture01.html"/>
    </resource>
    <resource identifier="CMD_0551410">
      <file href="lecture2.html"/>
    </resource>
  </resources>
</manifest>


...and here's what I'm trying to do:

Find the value of organizations/organization/item/item/@identifierref
Find the value in resources/resource/@identifier that matches it
and plug the corresponding file/@href value into here:

<xsl:attribute name="href">
<xsl:value-of select="file/@href"/>
</xsl:attribute>

...with an end result in html of, for example:
<a href="lecture01.html">Lecture 1</a>


Any help much appreciated.

<xsl:value-of select="resources/resource[@identifier=current()/organizations/organization/item/item/@identifierref]/file/@href" />

/- Sam Judson : Wrox Technical Editor -/