Recursion in pipelines

Thanks again for helping out. Your suggestion brought me a step further. The
pipeline is actually recuring, but it loops endlessly until tomcat crashes.
Appearently because the soap request sent to the pipeline isn't properly fed
to the input and thus the break condition is never reached.

First, I have a pipeline called model.xpl set up to handle incoming soap
requests (which is working fine):

       <p:processor name="oxf:request">
               <p:input name="config">
                       <config stream-type="xs:anyURI"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
                               <include>/request/body</include>
                       </config>
               </p:input>
               <p:output name="data" id="request"/>
       </p:processor>

       <p:processor name="oxf:url-generator">
               <p:input name="config" href="aggregate('config', aggregate('url',
#request#xpointer(string(/request/body))))"/>

               <p:output name="data" id="content"/>
       </p:processor>

       <p:processor name="oxf:identity">

               <p:input name="data" href="#content"/>
               <p:output name="data" id="identity"/>
       </p:processor>

       <p:processor name="oxf:pipeline">
               <p:input name="config"

href="http://127.0.0.1:8080/orbeon/service-experiment/recursion/"/>
               <p:input name="data" href="#identity#xpointer(//config)"/>
               <p:output name="data" id="recurse"/>
       </p:processor>

       <p:processor name="oxf:xslt">
               <p:input name="data" href="#recurse"/>
               <p:input name="config">
                       <soapenv:Envelope xsl:version="2.0">
                               <soapenv:Header/>
                               <soapenv:Body>
                                       <xsl:copy-of select="//experience"/>
                               </soapenv:Body>
                       </soapenv:Envelope>
               </p:input>
               <p:output name="data" id="response"/>
       </p:processor>

       <p:processor name="oxf:xml-serializer">
               <p:input name="config">
                       <config/>
               </p:input>

               <p:input name="data" href="#response"/>
       </p:processor>

As you can see, this pipeline delegates the actual operations to the
pipeline located at
http://127.0.0.1:8080/orbeon/service-experiment/recursion/, which (for
testing purposes) just does this:

   <p:param type="input" name="data"/>
   <p:param type="output" name="data"/>

   <p:choose href="#data">
       <p:when test="1 = 1">

               <p:processor name="oxf:identity">
                       <p:input name="data" href="#data"/>

                       <p:output name="data" ref="data"/>
               </p:processor>

       </p:when>
       <p:otherwise>...</p:otherwise>
   </p:choose>

After executing my webservice call (from soapUI), the orbeon log displays
the following error:
2010-09-21 12:13:39,206 INFO  ProcessorService  - /service-experiment/ -
Received request
2010-09-21 12:13:39,226 INFO  ProcessorService  -
/service-experiment/recursion/ - Received request
2010-09-21 12:13:39,262 INFO  ProcessorService  -
/service-experiment/recursion/ - Timing: 36 - Cache hits for cache.main:
244, fault: 4, adds: 4, expirations: 0, success rate: 98%
2010-09-21 12:13:39,265 ERROR ProcessorService  - Exception at
org.orbeon.oxf.common.ValidationException: : Fatal error: Premature end of
file.
null, line -1, column -1: Fatal error: Premature end of file.

Since model.xpl is working (I've tried it whithout the call to
http://127.0.0.1:8080/orbeon/service-experiment/recursion/), I tried sending
the soap request directly to
http://127.0.0.1:8080/orbeon/service-experiment/recursion/, which ended up
returning nothing in soapUI.

So I'm guessing, either I'm adressing the input or output pipeline the wrong
way. Would you have any suggestions on what I'm doing wrong?

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