Allowing other namespaced content in info

Fellow DocBook enthusiasts,

I would like to propose that we allow elements from other namespaces in
the info

elements for DocBook v5.0. Info should be allowed to contain additional

elements from any other namespace with the processing

expectation that they are not used for rendering.

This change will allow markup from other standards to

be more easily associated with content, without having

to be formalized in DocBook. Examples of this would

include Dublin Core metadata (DCMI), Open Digital

Rights Language (ODRL), IMS LOM, PRISM, etc. 

Modules could be easily developed to allow inclusion of

specific standards.

This would also allow multiple namespaced standards information to 

be contained in info, and thus associated with the DocBook content

that it is a child of.

For example:

<section xmlns="http://docbook.org/ns/docbook">

  <title>Example of multiple namespaced content in
<markup>info</markup></title>

  <info>

      <rdf:RDF
xmlns:prism="http://prismstandard.org/namespaces/basic/1.0/"        

        xmlns:prl="http://prismstandard.org/namespaces/prl/1.0/"       

        xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"       

        xmlns:dc="http://purl.org/dc/elements/1.1/"       

        xmlns:o-ex="http://odrl.net/1.1/ODRL-EX"      

        xmlns:o-dd="http://odrl.net/1.1/ODRL-DD">      

        <rdf:Description
rdf:about="http://scottysengineeringlog.net/sample.xml">        

          <dc:language>en-US</dc:language>

          <dc:creator>Scott C. Hudson</dc:creator>

          <dc:subject>XML, DocBook</dc:subject>

          <o-ex:rights>            

            <o-ex:agreement>

              <o-ex:permission>              

                <o-dd:display>                 

                  <o-ex:constraint>                    

                    <o-dd:industry
o-ex:type="prism:vocabs/SIC/6532"/>                    

                    <o-dd:spatial
o-ex:type="prism:vocabs/ISO-3166/US">                     

                      <o-ex:constraint>                       

                        <o-dd:datetime>                         

                         
<o-dd:start>2001-01-01T00:00:00</o-dd:start>                         

                        </o-dd:datetime>                        

                      </o-ex:constraint>                      

                    </o-dd:spatial>                    

                    <o-dd:spatial
o-ex:type="prism:vocabs/ISO-3166/GR">                     

                      <o-ex:constraint>                        

                        <o-dd:datetime>                          

                         
<o-dd:end>2003-12-31T23:59:59</o-dd:end>                        

                        </o-dd:datetime>                       

                      </o-ex:constraint>                      

                    </o-dd:spatial>                    

                  </o-ex:constraint>                 

                </o-dd:display>                 

              </o-ex:permission>              

              <o-ex:party>               

                <o-ex:context>                  

                 
<o-dd:uid>urn:prism.orgs:docbook.org</o-dd:uid>                 

                </o-ex:context>                

              </o-ex:party>             

            </o-ex:agreement>            

          </o-ex:rights>          

        </rdf:Description>        

      </rdf:RDF> 

  </info>

  <para>Hello World!</para>

</section>

One question that has been raised, is whether a separate
<foreign> element should be introduced as a child of info, that
could contain this kind of namespaced information or not?

Thoughts?

Thanks and best regards,

-- Scott