U-construct annotations

CP-projection

This annotation identifies a u-constructor that will create a CP node with an empty head. These empty CP's are projected from IP's in the absence of an overt complementizer. For example, in "John thinks the dog is big", the IP headed by "is" will project to a CP, even though there is no overt complementizer "that". Of course, in cases where there is an overt complementizer, the operator that creates the CP headed by the complementizer is preferred to the operator that creates the empty CP.

Duplicate-relation

This annotation identifies a u-constructor that will create a structural link that duplicates one that already exists in the model. These operators are created because the generator and constraint checks do not explicitly check to see if the position(s) to be filled by the operator is in fact empty. Once established, a duplicate relation will immediately trigger a snip to repair the structure. Thus, a u-constructor that is annotated duplicate-relation will generally also include a snip operation.

Adjunction

This annotation identifies a u-constructor that will do a Chomskian-style adjoin from one structure to another, as opposed to placing them in the relation of complement or specifier.