supplies a binary value. provides a name for the feature. (Feature library) assembles a library of feature elements. specifies the type of the feature structure. references the feature-value specifications making up this feature structure. supplies an upper bound for the numeric value represented. indicates organization of given value or values as set, bag or list. supplies a name for the sharing point. indicates the organization of the resulting merged values as set, bag or list. (indicates that the resulting values are organized as a set.) (indicates that the resulting values are organized as a list.) (Value negation) represents a feature value which is the negation of its content.