Each WSDL __________________ can define a set of __________________ and/or __________________ messages to express data exchange requirements. Select the correct answer.

Question

Options

• Aoperation, type, RPC
• Boperation, input, output
• Cfunction, type, RPC
• Dfunction, operation, type

• A
  6% (2)
• B
  92% (33)
• D
  3% (1)

Explanation

Option B is correct because in WSDL (Web Services Description Language), an operation is the fundamental unit that describes a specific action a web service can perform, and each operation is defined by its input and/or output messages - input describing the data sent to the service, output describing the data returned. Operations can be one-way (input only), request-response (input + output), or solicit-response (output + input).

Why the distractors fail:

• A is wrong because while "operation" is correct, type and RPC don't fit - <types> is a separate WSDL section (for XML schema definitions), and RPC is a binding style, not a message category.
• C is wrong because WSDL uses operation, not "function" - that's not WSDL vocabulary at all.
• D is wrong for the same reason: "function" doesn't exist in WSDL, and "operation" and "type" play different roles in the document structure, not within the same definition context.

Memory tip: Think of a WSDL operation like a vending machine - you put something in (input message) and get something out (output message). Operations = the machine; messages = what goes in and comes out.

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