Serve per il ciclo for all'interno di un file:

     <xsl:for-each select="/Entities/Travel">
           <tr>
            <td >
                 Passenger:
            </td>
            <td >
                 <xsl:value-of select="/Entities/Contact[ContactId/. = ContactId/.]/FullName/." /> 
            </td>
            <td >
                 Passenger CustomerCode:
            </td>
            <td >
                 <xsl:value-of select="/Entities/Contact[ContactId/. = ContactId/.]/CustomerCode/." />
            </td>           
           </tr>
       </xsl:for-each>