These pipelines run two different session manipulations:

     <map:match pattern="session">
        <map:generate type="file" src="session.xml"/>
        <map:transform type="session"/>
        <map:serialize type="xml"/>
     </map:match>

     <map:match pattern="session-next">
        <map:generate type="file" src="session-next.xml"/>
        <map:transform type="session"/>
        <map:serialize type="xml"/>
     </map:match>