{message label} property of Binding Message Reference Component Should be REQUIRED

The {message label} property of the Binding Message Reference component 
[1] should be REQUIRED. This property always exists, however, it is 
allowed to be OPTIONAL in the XML infoset because it can be inferred in 
the case that there is exactly one message with the specified {direction} 
property in the MEP. It is OK to have it OPTIONAL in the XML infoset as an 
authoring convenience. But this property always has a definite value so it 
should be REQUIRED in the Component Model.

[1]http://www.w3.org/TR/2004/WD-wsdl20-20040803/#Binding_Message_Reference

Arthur Ryman,
Rational Desktop Tools Development

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