Using xfmap to create multiple values for one attribute

I am currently mapping a MVDxml and I am not able to create multiple values for an attribute.

This is what I want to map:

<ConceptRoot uuid="e4b5239f-16dd-4813-a632-71911712a26d" name="IfcWall" status="proposal" applicableRootEntity="IfcWall">

 

<Applicability uuid="00000000-0000-0000-0000-000000000000" status="sample">

 

<Template ref="ad664563-049e-45d1-8379-1553f9172d33" />

 

<TemplateRules operator="and" />

 

</Applicability>

 

<Concept uuid="6082a8f9-f04c-44c6-a4ce-61bf4a12dbbb" name="Property Sets for Objects" status="sample" override="false">

<Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />

<TemplateRules operator="and">

<TemplateRule Parameters="PsetName[Value]='Pset_WallCommon'" />

<TemplateRule Parameters="PsetName[Value]='Pset_ConcreteElementGeneral'" />

<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementFabrication'" />

<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementGeneral'" />

<TemplateRule Parameters="PsetName[Value]='Pset_ReinforcementBarPitchOfWall'" />

</TemplateRules>

</Concept>

</ConceptRoot>

This is my current xfmap attempt:

<?xml version="1.0"?>

<xfMap>

<feature-map multi-feature-construction="true">

<mapping match="ConceptRoot">

<feature-type> <extract expr="@name"/> </feature-type>

</mapping>

</feature-map>

<feature-content-map>

<mapping match="Concept">

<attributes>

<attribute>

<name>

<extract expr="@name"/>

</name>

<value>

<extract expr="./TemplateRules/TemplateRule[@Parameters]"/>

</value>

</attribute>

</attributes>

</mapping>

</feature-content-map>

</xfMap>

I am currently getting one Feature called IfcWall with the attribute Property Sets for Objects, but I get only one value which is PsetName[Value]='Pset_WallCommon'. My Question is: In what way do I have to change my xfmap so that all the other elements show up as values. (Like PsetName[Value]='PsetConcreteElementGeneral' and so on)

 

*edit

added some pictures for better visibility