namespaces and xsl:template match

Dear community,

following an excerpt from an xmi-document, i want to
transform:

<?xml version = '1.0' encoding = 'UTF-8' ?>
<XMI xmi.version = '1.2' xmlns:UML =
'org.omg.xmi.namespace.UML'
  <XMI.header>
    <XMI.documentation>
    </XMI.documentation>
  </XMI.header>
  <XMI.content>
    <UML:Model xmi.id = 'a1' name = 'Canoo' isSpecification
= 'false' isRoot = 'false'
      isLeaf = 'false' isAbstract = 'false'>
	 ...

      <UML:Namespace.ownedElement>
        <UML:Class xmi.id = 'a4' name = 'Energie' visibility
= 'public' isSpecification = 'false'
          isRoot = 'false' isLeaf = 'false' isAbstract =
'false' isActive = 'false'>


       ...

and a xslt which looks like this:

<xsl:stylesheet version="1.0"

xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:UML="http://org.omg/UML/1.3"
                xmlns:zoph="http://zoph">

   <xsl:output indent="no" method="xml"
encoding="iso-8859-1"/>

   <xsl:template match="XMI.header">
   	<header/>
   	<!-- ignore XMI.header section -->
   </xsl:template>

   <xsl:template match="XMI.content">
   	<content/>
   		<xsl:apply-templates/>
   </xsl:template>

   <xsl:template match="UML:Namespace.ownedElement">
   	<ownedElement/>
   	<xsl:apply-templates/>
   </xsl:template>

   <!-- xsl:template match="UML:*">
   	<test/>
   	<xsl:apply-templates/>
   </xsl:template -->

   <xsl:template match="UML:Class">
   	<zoph:element>
   		<xsl:attribute name="name"><xsl:value-of
select="./@name"/></xsl:attribute>
   	</zoph:element>
   </xsl:template>

   <xsl:template match="UML:Model">
   	<xsl:apply-templates/>
   </xsl:template>

When processing this xslt does not produce any output. When
I change the <xsl:template
match="UML:Namespace.ownedElement"> to <xsl:template
match="UML_Namespace.ownedElement"> it produces output, but
sure, not I am wanting.

How to process namespaceprefixed tags like <UML:Model>?
Where to pay attention? Is my understanding wrong to use
xsl:template match="UML:.... or "UML:*" for all?

Using ant and xalan 2 fyi.

Thanks in advance for your answer. Have a nice weekend!

- Christof


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