Definition of Interface Message Reference

Hi Gurus,

I had a clarification.
Part 1 defines Interface message reference as follows.
"An Interface Message
Reference<http://www.w3.org/TR/wsdl20/#component-InterfaceMessageReference>component
associates a defined element with a message exchanged in an
operation. By default, the element is defined in the XML Infoset [XML
Information Set <http://www.w3.org/TR/wsdl20/#XMLInfoSet>]."

But it may not always associate a defined element with the message rite ? -
in case the message content model is #none, the message is not associated
with any element.

Also, in the second sentence above, what does it mean to say "by default,
the element is defined in the XML infoset" ? Where is the defaulting defined
?

Do let me know.

rgds,
Ram


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