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Subject: JSR286's MULTI-PHASE render not supported in WSRP 2.0

Recent drafts of JSR-286 have included the concept of multi-phase 
render. This allows a portlet to populate headers (including cookies) 
and add elements to the <head> (such as script, style and meta elements) 
section of the surrounding page.

WSRP 2.0 currently does not support this. There are a number of ways we 
can support this:

   1. Like JSR-286 defines
         1. Portlet Descriptsion [O] boolean isMultPhaseRenderSupported
         2. MimeRequest [O] QName renderPhase
                * wsrp:head
                * wsrp:body
          * Requires structural changes to spec late in the spec
          * Allows full independent caching of head an body separately
   2. As discussed on the call: make the producer call the 286 portlet
      twice and make the consumer cache head info
         1. Consumer calls getMarkup on the portlet before rendering its
            headers and <head> section
         2. The producer calls the 286 portlet twice
               1. for HEAD
               2. for BODY
         3. The getMarkupResponse contains both the <head> and <body>
            sections as well as any headers
         4. The consumer sets the headers, renders the head and caches
            the body
         5. The consumer later renders the body
          * Requires no WSRP spec changes (although some notes would be
          * Need to bend the no <head>/<body> tag rule
          * Requires the consumer to cache markup
          * Does not allow independent caching of head and body
   3. As discussed with Stefan: Send a WSRP defined event
         1. The consumer sends a wsrp:getHead event
         2. The response MUST contain a updateResponse with
            markupContext populated
         3. The consumer MUST interpret this as the head content and NOT
            the normal content
          * Requires little spec change
          * Requiring markup as a response to an event seems odd (as
            compared to the rest of the spec), same for special
            interpretation on the consumer
          * Allows full independent caching of head an body separately
   4. Add a well known resource name (e.g. wsrp:head)
         1. The consumer calls getResource() during head render phase
            which returns head and headers
          * This would require advertisement of the head section
            (similar to solution #1)
          * Allows full independent caching of head an body separately
   5. Do nothing/use vendor dependent extensions

For what its worth: BEA Weblogic Portal already supports multi-phase 
render as an extension called getRenderDependencies(). This has worked 
fairly well for us so far. However we would prefer to interoperate with 
3rd party consumers and producers.



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