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By contrast, there are other modifiers which only serve to select which of two or more options pertains, e.g. left in left hand. There is nothing else to say about the laterality of the hand and, hence, no reason to create a Feature. Such modifiers are termed Selectors, which are linked by a single attribute in the simpler schema:

Category which hasXSelector Selection.

for example:

Hand which hasLeftRightSelector leftSelection.

Many selectors such as left/right, upper/lower, etc. interact with the part-whole structure in important ways, e.g. the right hand can only be part of the right arm. The simpler schema above makes the implementation of these patterns more efficient using GRAIL constructs for transitivity.

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