IRML Question

I have a rule module which defines two rules for a content_provider.

At processing point '1' the rule is as follows

<owner class="content_provider" >
        <name> Mozilla Org </name>
        <id>www.mozilla.org</id>
</owner>
<protocol> http </protocol>

<rule  processing-point=1>
    <property name="C-Man" 
        matches="http://www.w3.org/1999/06/24-CCPPexchange"; >
    <action>parseCCPP</action>
    </property>
</rule>


I am trying to perform an action based on the property name "C-Man" that was
provided with the request at point 3. That is, I would like to express a
rule as follows

<rule  processing-point=3>
    <request.property name="C-Man" 
        matches="http://www.w3.org/1999/06/24-CCPPexchange"; >
    <action>transformContent</action>
    </property>
</rule>

Notice the "request" prefix before the property tag which implies I am
referring to a header element in the request header which will not be
available in the response header. 
Is there a way to do that with current IRML spec?
Any help is appreciated.

regards
-Reza