RE: [xsl] Using keys to build a tree represented in XMI

["Michael Kay" <mike@xxxxxxxxxxxx>]

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@xxxxxx]
> Sent: 28 December 2005 18:32
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> 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 don4t 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 aggregation4s direction can be seen in the
> "aggregation"
> attribute of each of the two end points ("none" ->
> "aggregate"). But after
> identifying the leaf classes I don4t 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
>
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