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A MethodDef defines how a data value can be obtained from a collection of other data values. The Description element must be provided and should include a prose description. The MethodSignature element must also be provided and identifies the input parameter and return values for the MethodDef. The Description and MethodSignature are the normative content of the MethodDef.
If a FormalExpression is provided, it must contain a machine-readable expression that implements the Description and MethodSignature. Multiple FormalExpressions can be provided if each has a different Context attribute, allowing the same expression to be represented in forms appropriate to multiple systems. A FormalExpression can reference an external code library such that it can be retrieved for execution at run-time. If MethodDef execution order must be specified then use workflows for this purpose.