[Name] ATTR_OR_LIST_ATTR

[Description] Like ATTR, but it is valid for the user to select a list rather than just a single
attribute. This is exactly equivelent to ATTR NO_EXPAND_LIST.

              If Incoming Attributes are:
                _creation_instance
                aList{}
                aNested{}.nested{}
                list{}.a
                aNested{}.structure{}.b
              
              All incoming attributes appear in the dropdown which will look like:
                _creation_instance
                aList{}
                aNested{}.nested{}
                aNested{}.structure{}.b
                list{}.a
                

In a Transformer (*.fmx) File

   Syntax

      PARAMETER_NAME: <macroName>
      PARAMETER_TYPE: ATTR_OR_LIST_ATTR[:<inputPortName>] [ALLOW_NEW]
      PARAMETER_PROMPT: <label>
      PARAMETER_DEFAULT: [<defaultValue>]
   
   Example

      PARAMETER_NAME: REFERATTR
      PARAMETER_TYPE: ATTR_OR_LIST_ATTR:REQUESTOR
      PARAMETER_PROMPT: Requestor Join Attribute:
      PARAMETER_DEFAULT: