A CASE element must contain a list of all possible values for this parameter. Currently, only parameters of type bool or string are allowed to contain a CASE element. If you do not specify any default value, the last ITEM found in the list is used as default value.
<PARAM id="color" type="string" default="red"> <CASE> <ITEM value="red"/> <ITEM value="green"/> <ITEM value="blue"/> </CASE> </PARAM>
Within a PARAM definition, you should not specify both CASE and CONSTRAINTS at the same time.