Thus, the referring expression generator used only one relation, namely the "part-of" relation.
Let us first sharpen our understanding of the part-of relation.
The principles for the (proper) part-of relation imply that complexes with the same parts are identical.
The supplementation principle together with the uncontroversial axioms for the (proper) part-of relation also implies the more controversial thesis that complex objects with the same parts are identical (see Mereology, 3.2).
Independently of his counterpart theory, Lewis's definition of a possible object has some peculiar consequences, given that existence in general is understood as bearing of the part-of relation to the whole that constitutes the domain of discourse.
A further plausible principle for the part-of relation is the supplementation principle: if x is part of y, there is an object z that is part of y and that does overlap, that is, have a part in common, with x.
We use the part-of relation to assert, as axioms, that model components must be part of a model, that physical objects can only have physical objects as part and that processes can only have other processes as part.
Relations other than hyponymy that have been targeted, of relevance to language understanding, include part-of relations, causal relations, and telic relations (such as that the use of milk is to drink it).
The entity relations (REL) task, a supporting task of the BioNLP shared task 2011 [30], deals with the extraction of two types of part-of relations between a gene or protein and an associated entity.
Because the evaluation focuses on photosynthesis, rather than cell anatomy, the part-of relations between entities (e.g., a chloroplast is a part of a plant cell) were removed.
