document() and attribute

 hello, do any one help me to solve the following problem

 in a.xml contain b.xml file's element fellow's id, i got the fellow id 
from the a.xml file and put it into a variable $fellowID, and then i want to 
achieve the fellow details through b.xml file using element fellow's url

<!-- a.xml --->

...
 <!-- owner related to fellow element in b.xml -->
  <owner id="a" />
  <owner id="b" />

<!-- b.xml  -->
<fellowlist>
 <fellows>
  <fellow id="a" url="atext.xml" />
  <fellow id="b" url="btext.xml" />
 </fellows>
<fellowlist>


<!-- a.xsl -->

 ...
 <xsl:variable name="ownerID">
       <xsl:apply-templates select="./owner" />
  </xsl:variable>

  <xsl:variable name="href">
      <xsl:apply-templates select="document(b.xml')/fellow[(_at_)id=$ownerID]" 
/>
  </xsl:variable>
  <!-- do something like sort and outputting -->

<xsl:template match="owner">
  <xsl:value-of select="@id" />
<xsl:template>

<xsl:template match="fellow">
 <xsl:value-of select="@url" />
</xsl:template>

..


  but every time i cannot get the value of @url,could anyone know why?

thanks a lot


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