& XSLT I'm not sure exactly what you're trying to do here, but perhaps I can see
what you are doing wrong.

You have defined this key:

<xsl:key name="aggregation_by_classReference"
match="UML:Association.connection"

so this expression:

key('aggregation_by_classReference',./@xmi.id)

will return zero or more UML:Association.connection elements, and this
expression:

key('aggregation_by_classReference',./@xmi.id)/@xmi.id

will return their @xmi.id attributes.

But there is only one UML:Association.connection element in your sample
data, and it does not have an @xmi.id attribute.

Michael Kay
http://www.saxonica.com/

>  -----Original Message-----
>  From: Christian Solisch [mailto:christian.solisch@[...].de] 
>  Sent: 28 December 2005 18:32
>  To: xsl-list@[...].com
>  Subject: [xsl] Using keys to build a tree represented in XMI
>  
>  Hi community,
>  
>  I am new to XSLT and actually trying to use it for a 
>  transformation of a XMI
>  file. After two weeks of trying I really don´t know how to 
>  proceed. I am not
>  sure, if XSLT is really what I need to get the job done. Any 
>  help (or hint
>  to use anything else ;-) will be really appreciated!
>  
>  I use Saxon 8.6.1 on XSLT 2.0
>  
>  In an UML tool (enterprise architect) I modelled a 
>  tree-structure consisting
>  of classes. They are stereotyped by <<node>> and <<leaf>> and 
>  connected by
>  aggregations. After exporting it to XMI I like to generate 
>  the path for each
>  leaf (leading from root to leaf).
>  
>  After digging out that an aggregation points to both 
>  connected classes and
>  each class references its stereotype, I tried to use keys to 
>  resolve the
>  references. The aggregation´s direction can be seen in the 
>  "aggregation"
>  attribute of each of the two end points ("none" -> 
>  "aggregate"). But after
>  identifying the leaf classes I don´t manage it to follow the 
>  aggregation...
>  
>  Here is my stylesheet:
>  
>  <?xml version="1.0" encoding="UTF-8"?>
>  <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>  version="2.0" xmlns:UML="org.omg.xmi.namespace.UML"
>  exclude-result-prefixes="UML">
>  
>  <!-- *** <Keys> ************************************************ -->
>  <xsl:key name="package_by_name" match="UML:Package" use="@name" />
>  <xsl:key name="stereotype_by_name" match="UML:Stereotype" 
>  use="@name" />
>  <xsl:key name="class_by_stereotypeReference" match="UML:Class"
>  use="UML:ModelElement.stereotype/UML:Stereotype/@xmi.idref" />
>  <xsl:key name="class_by_ID" match="UML:Class" use="@xmi.id" />
>  <xsl:key name="aggregation_by_classReference"
>  match="UML:Association.connection"
>  use="UML:AssociationEnd[@aggregation='none']/UML:AssociationEn
>  d.participant/UML:Class/@xmi.idref"
>  />
>  <!-- *** </Keys> *********************************************** -->
>  
>  
>  <xsl:template match="/">
>  <xsl:apply-templates select="key('stereotype_by_name', 'leaf')" />
>  </xsl:template>
>  
>  <xsl:template match="UML:Stereotype">
>  <xsl:apply-templates 
>  select="key('class_by_stereotypeReference', @xmi.id)"/>
>  </xsl:template>
>  
>  <!-- now i should have only leaf classes -->
>  <xsl:template match="UML:Class">
>    <xsl:for-each select="." >
>    <!-- here i have to find the aggregation -->
>    <!-- pointing to this class, actually not working -->
>      <xsl:value-of
>  select="key('aggregation_by_classReference',./@xmi.id)/@xmi.id"/>
>    </xsl:for-each>
>  </xsl:template>
>  </xsl:stylesheet>
>  	
>  A part of the XMI file looks like this:
>  
>  <XMI.content>
>   <UML:Model name="Views" xmi.id="Model_id_1">
>    <UML:Namespace.ownedElement>	
>  	
>     <UML:Stereotype xmi.id="Stereotype_id_1" name="node" 
>  ></UML:Stereotype>
>     <UML:Stereotype xmi.id="Stereotype_id_2" name="leaf" 
>  ></UML:Stereotype>
>  		
>     <UML:Package name="Package_Tree" xmi.id="Package_id_1">
>      <UML:Namespace.ownedElement>
>  
>       <UML:Class name="Node_1" xmi.id="Node_id_1">
>        <UML:ModelElement.stereotype>
>         <UML:Stereotype xmi.idref="Stereotype_id_1"/>
>        </UML:ModelElement.stereotype>
>       </UML:Class>
>  
>       <UML:Association xmi.id="Aggregation_id_1">
>        <UML:Association.connection>
>  
>         <UML:AssociationEnd aggregation="none">
>          <UML:AssociationEnd.participant>
>           <UML:Class xmi.idref="Node_id_2"/>
>          </UML:AssociationEnd.participant>
>         </UML:AssociationEnd>
>  
>         <UML:AssociationEnd aggregation="aggregate">
>          <UML:AssociationEnd.participant>
>           <UML:Class xmi.idref="Node_id_1"/>
>          </UML:AssociationEnd.participant>
>         </UML:AssociationEnd>
>  
>        </UML:Association.connection>
>       </UML:Association>
>  
>       <UML:Class name="Node_2" xmi.id="Node_id_2">
>        <UML:ModelElement.stereotype>
>         <UML:Stereotype xmi.idref="Stereotype_id_2"/>
>        </UML:ModelElement.stereotype>
>       </UML:Class>
>  
>      </UML:Namespace.ownedElement>				
>  		   </UML:Package>
>  
>    </UML:Namespace.ownedElement>
>   </UML:Model>
>  </XMI.content>
>  	
>  So if somebody could help me with some ideas how to follow 
>  the connection
>  between my nodes, I would be very happy!
>  
>  Thanks in advance
>  Christian
>  
>  -- 
>  Telefonieren Sie schon oder sparen Sie noch?
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