What are endocentric construction and exocentric construction? （武汉大学，2004）

An endocentric construction is one whose distribution is functionally equivalent, or approaching equivalence, to one of its constituents, which serves as the center, or head, of the whole. A typical example is the three small children with children as its head. The exocentric construction, opposite to the first type, is defined negatively as a construction whose distribution is not functionally equivalent to any of its constituents. Prepositional phrasal like on the shelf are typical examples of this type.