Gets the collection of instances of the System.Web.Services.Description.Message class defined by the current System.Web.Services.Description.Operation.
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Because an System.Web.Services.Description.Operation is associated with exactly one System.Web.Services.Description.OperationInput and exactly one System.Web.Services.Description.OperationOutput, only one instance of each can be a member of this collection, and thus the collection can have a maximum of two members.