XSLT: How to find source and target Xpath for the edge? - xslt

Question

I want to write an xslt file to transfer an xmi file in a graphical file. But I meet the problem that the edge can not connect the right source node and target node. I have tried already two weeks. But I am still confused. Please help me. Thanks a million.
The original code is:
<?xml version="1.0" encoding="UTF-8"?>
<xml xmlns:xmi="#">
<element xmi:id="BasicElement-Line1" name="Line1" xmi:type="association"/>
<element xmi:id="BasicElement-Line2" name="Line2" xmi:type="association"/>
<element xmi:id="BasicElement-Object1" name="Object1" xmi:type="class">
<ownedAttribute xmi:type="Property" name="input" type="BasicElement-Object2" association="BasicElement-Line1"/>
<ownedAttribute xmi:type="Property" name="output" type="BasicElement-Object3" association="BasicElement-Line2"/>
</element>
<element xmi:id="BasicElement-Object2" name="Object2" xmi:type="class">
</element>
<element xmi:id="BasicElement-Object3" name="Object3" xmi:type="class">
</element>
</xml>
and my aim code is:
<?xml version="1.0" encoding="UTF-8"?>
<xmi xmlns:y="##">
<edge target="N1002D" source="N1001B" id="N10005">
<y:PolyLineEdge>
<y:Arrows target="none" source="none" />
</y:PolyLineEdge>
</edge>
<edge target="N1002D" source="N1001B" id="N10010">
<y:PolyLineEdge>
<y:Arrows target="none" source="none" />
</y:PolyLineEdge>
</edge>
<node id="N1001B">
<y:NodeLabel>BasicElement-Object1</y:NodeLabel>
</node>
<node id="N1002D">
<y:NodeLabel>BasicElement-Object2</y:NodeLabel>
</node>
<node id="N10033">
<y:NodeLabel>BasicElement-Object3</y:NodeLabel>
</node>
</xmi>
Because there will be more "class" element in the future. So I used "{generate-id()}" to define the node IDs. But when I do that, I found the edge can not find the way of source node and target node. So I have already worked on it two weeks and have no idea on it. Please help me, I really appreciate.

Answer 1

I'm not really familiar with XMI and the target format, but here's something that should fit your description.
Source:
<?xml version="1.0" encoding="UTF-8"?>
<xml xmlns:xmi="#">
<element xmi:id="BasicElement-Line1" name="Line1" xmi:type="association">
<ownedEnd xmi:type="Property" type="BasicElement-Object1" association="BasicElement-Line1"/>
</element>
<element xmi:id="BasicElement-Line2" name="Line2" xmi:type="association">
<ownedEnd xmi:type="Property" type="BasicElement-Object1" association="BasicElement-Line2"/>
</element>
<element xmi:id="BasicElement-Object1" name="Object1" xmi:type="class">
<ownedAttribute xmi:type="Property" name="input" type="BasicElement-Object2" association="BasicElement-Line1"/>
<ownedAttribute xmi:type="Property" name="output" type="BasicElement-Object3" association="BasicElement-Line2"/>
</element>
<element xmi:id="BasicElement-Object2" name="Object2" xmi:type="class">
</element>
<element xmi:id="BasicElement-Object3" name="Object3" xmi:type="class">
</element>
</xml>
Transformed with (adjust the namespaces to the correct uris):
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xmi="#" xmlns:y="##"
exclude-result-prefixes="xmi" version="1.0">
<xsl:output indent="yes"/>
<xsl:template match="xml">
<xmi>
<xsl:apply-templates select="element"/>
</xmi>
</xsl:template>
<xsl:template match="element[#xmi:type='class']">
<node id="{generate-id()}">
<y:NodeLabel>
<xsl:value-of select="#xmi:id"/>
</y:NodeLabel>
<y:UMLClassNode/>
</node>
</xsl:template>
<xsl:template match="element[#xmi:type='association']">
<!-- association name -->
<xsl:variable name="association" select="ownedEnd/#association"/>
<!-- id of source -->
<xsl:variable name="ownedEnd-type" select="ownedEnd/#type"/>
<!-- using association variable to select the correct id of target -->
<xsl:variable name="ownedAttribute-type"
select="//element[#xmi:id = $ownedEnd-type]/ownedAttribute[#association = $association]/#type"/>
<edge id="{ generate-id() }"
source="{ generate-id( /xml/element[#xmi:id = $ownedEnd-type] ) }"
target="{ generate-id( /xml/element[#xmi:id = $ownedAttribute-type] ) }">
<y:PolyLineEdge>
<y:Arrows source="none" target="none"/>
</y:PolyLineEdge>
</edge>
</xsl:template>
</xsl:stylesheet>
gives you:
<xmi xmlns:y="##">
<edge id="d0e3" source="d0e13" target="d0e20">
<y:PolyLineEdge>
<y:Arrows source="none" target="none"/>
</y:PolyLineEdge>
</edge>
<edge id="d0e8" source="d0e13" target="d0e23">
<y:PolyLineEdge>
<y:Arrows source="none" target="none"/>
</y:PolyLineEdge>
</edge>
<node id="d0e13">
<y:NodeLabel>BasicElement-Object1</y:NodeLabel>
<y:UMLClassNode/>
</node>
<node id="d0e20">
<y:NodeLabel>BasicElement-Object2</y:NodeLabel>
<y:UMLClassNode/>
</node>
<node id="d0e23">
<y:NodeLabel>BasicElement-Object3</y:NodeLabel>
<y:UMLClassNode/>
</node>
</xmi>