XSL-selectsomevalue-problem

name        value
nisse          10
olle            11

and don't display the id, domain, name and value for  domain assi02

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl"  ?>
<pexml>
    <items>
          <item>
               <id>"hej"</id>
               <domain>"assi01"</domain>
               <params>
                    <param>
                         <name>nisse</name>
                         <value>10</value>
                    </param>
                    <param>
                         <name>olle</name>
                         <value>"01"</value>
                    </param>
               </params
               <items>
                    <item>
                         <id>"hej:hej1"</id>
                         <domain>"assi02"</domain>
                         <params>
                             <param>
                                  <name>kalle</name>
                                  <value>11</value>
                              </param>
                              <param>
                                   <name>pelle</name>
                                   <value>111</value>
                              </param>
                            </params>
                     </item>
               </items>
          </item>
     </items>
</pexml>

Should I use some kind of <xsl:if> or <xsl:when> or possibly <xsl:value-of select="@domain='assi01'">
????Help needed
//Peter