Break a for-each

Hello,

I have an XML file called "ReferenceAuthentified.xml" which contains some informations
like this :

<ReferenceAuthentified>
<SingleElement
                  SubsetName="HMBASE"
                    .....
</SingleElement>
....
</ReferenceAuthentified>

I have also severals XML files called "CurrentAuthentified1.xml", "CurrentAuthentifiedn.xml"
which contain also SingleElement. For example :

The CurrentAuthentified1.xml contains

<CurrentAuthentified1>
<SingleElement
                  SubsetName="NGPBASE"
                    .....
</SingleElement>
...
</CurrentAuthentified1>
...
The CurrentAuthentifiedn.xml contains

<CurrentAuthentifiedn>
<SingleElement
                  SubsetName="HMBASE"
                    .....
</SingleElement>
...
</CurrentAuthentifiedn>

With all this file, I must build an XML file called SubsetDescriptor.xml which contains all the
SubsetName present in the "ReferenceAuthentified.xml" :

<SubsetDescriptor>
   <Subset  subsetName="HMBASE"
                        ...
                   impactedByEvolution="true"
   </Subset>
 .....
</SubsetDescriptor>

I must inform an attribute called impactedByEvolution with true or false.

<xsl:attribute name="impactedByEvolution">

        <xsl:for-each select="$XslParameterFile//InputFile/@*
                      [starts-with(name(),'CurrentAuthentified')]">

           <xsl:variable name="currentAuthentifiedFile"
                         select="document(.)"/>

              <!-- check if the subset is found    -->
              <!-- in the currentAuthentified -->
              <xsl:variable name="occurenceNumber">
                <xsl:value-of select="count($currentAuthentifiedFile
                                  //Subset[@subsetName=$subsetName])"/>
              </xsl:variable>

              <!-- interpret the result -->
              <xsl:choose>

                <xsl:when test="$occurenceNumber='0'">
               </xsl:when>

                <!-- subset found more than 0 -->
                <xsl:otherwise>

                   <xsl:value-of select="'true'"/>

                </xsl:otherwise>

              </xsl:choose>
          <!--</xsl:for-each>-->
 </xsl:attribute>

My problem is as follows :
- If I find the subsetName in the first CurrentAuthentified how can I break the loop ?

- If I do not find the subsetName in all the CurrentAuthentified how to know that I did not find it
because I want to inform the impactedByEvolution attribute to "'false'" ?

If my problem is not  enough clear, tell me, I will give you more information
Thanks for help



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