Used for defining the operation to perform in ESS_PREDICATE_T:
ESS_CHILDREN
ESS_DESCENDANTS
ESS_BOTTOMLEVEL
ESS_SIBLINGS
ESS_SAMELEVEL
ESS_SAMEGENERATION
ESS_PARENT
ESS_DIMENSION
ESS_NAMEDGENERATION
ESS_NAMEDLEVEL
ESS_SEARCH
ESS_WILDSEARCH
ESS_USERATTRIBUTE
ESS_ANCESTORS
ESS_DTSMEMBERS
ESS_DIMUSERATTRIBUTES
ESS_INDEPDIMS
ESS_SIBLINGS65
ESS_INDEPDIMS_DISCRETE
ESS_INDEPDIMS_CONTINUOUS