Re: compund SOAP structure...

Yes. Section 2.3 of [1] talks about nesting:

     Representations of compound SOAP structures MAY be nested by having

     a secondary part of one representation contain a representation of=20
     another compound SOAP structure. In this case, the primary SOAP=20
     message part is the primary SOAP message part of the outermost=20
     representation and as for any other secondary part, the semantics=20
     of the primary SOAP message part provides the processing context=20
     for the nested representation(s).=20

And it is also discussed as part of determining the base URI in section
3.2.1:

     2.   Base URI of the encapsulating entity: If there is a DIME=20
          record identifier with an absolute URI as value then that URI=20
          is the base URI of the part. In the case of nested DIME=20
          messages, this step may be repeated in the order from=20
          innermost to outermost in order to determine the most specific

          base URI.=20

>The DIME specification allows DIME message nesting. The=20
>WS-Attachments draft does not mention anything about nested=20
>compound SOAP structures. So my question is: is it possible to=20
>have nested compound SOAP structures?

Hope this helps,

Henrik

[1] http://www.ietf.org/internet-drafts/draft-nielsen-dime-soap-01.txt