If you enable validation in your message flow, and your message is
in the MRM domain, wildcard attributes are validated against the model according
to the following rules:
- If Process Content is set to strict, only attributes which are declared
in the same message set will be allowed to appear in place of the wildcard
attribute.
- If Process Content is set to lax or skip,
any attribute will be allowed to appear in place of the wildcard attribute.
Tip: If the namespace property is set to the namespace of
the message set, these rules are then similar to the behavior of the XMLNSC
domain in validating mode.