2.1.30 Function ReturnType
ReturnType describes the shape of data that is returned from a Function. The return type of a function can be declared as a ReturnType attribute on a Function or as a child element.
The following is an example of the return type of a function declared as a ReturnType attribute on a Function.
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<Function Name="GetAge" ReturnType="Edm.Int32">
The following is an example of the return type of a function declared as a child element.
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<Function Name="GetAge"> <ReturnType Type="Edm.Int32" /> </Function>
The following rules apply to the ReturnType element of a function:
ReturnType MUST define type declaration either as an attribute or as a child element.
ReturnType cannot contain both an attribute and a child element defining the type.
ReturnType can contain any number of AnnotationAttribute attributes. The full names of the AnnotationAttribute attributes MUST NOT collide.
The return type of Function MUST be one of the following:
A scalar type or collection of scalar types.
An entity type or collection of entity types.
A complex type or collection of complex types.
A row type or collection of row types.
A reference type or collection of reference types.
ReturnType can contain a maximum of one CollectionType element.
ReturnType can contain a maximum of one ReferenceType element.
ReturnType can contain a maximum of one RowType element.
ReturnType can contain any number of AnnotationElement elements.
AnnotationElement elements are to be last in the sequence of child elements of ReturnType.

All child elements are to appear in the order indicated. For all child elements within a given choice, the child elements can be ordered arbitrarily.