Collocation is the act of positioning close together (or side by side). It is used, for example, about the different instantiations of a work in a library catalog. (An instantiation is a representation of an idea, a subject, a concept or a work in the form of an instance of it; to represent an abstraction by a concrete instance).
In classifications are things (or concepts) collocated according to some criteria of likeliness.
Smiraglia, R. P. (2001). The nature of “A Work”. Implications for the Organization of Knowledge. Lanham, Maryland: The Scarecrow Press, Inc.
See also: Work