This parameter allows you to specify directly the names of WSDL message definitions to be documented in separate 
<b><i>Message Documentation</i></b> blocks.
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These should be the local names (without namespace prefixes) of WSDL message definitions separated with newlines or semicolons (';').
Only messages with the specified names will be documented.
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When the list of names is empty (the parameter is not specified), all WSDL message definitions will be documented.