Collection-Types

The behavior called :collection-types specifies how the FRS interprets multiple values for a slot. The possible values are:

• :list -- The order of values within a slot is important, and duplicate values are permitted
• :set -- The order of values within a slot is unimportant, and duplicate values are not permitted
• :multiset -- The order of values within a slot is unimportant, and duplicate values are permitted (also known as a bag)
• :none - The FRS does not support multiple-valued slots.

Some FRSs may support more than one possible interpretation, in which case, the :collection-type facet specifies how multiple values are to be interpreted for a particular slot. The first behavior value specified is the default.