This package offers a means to remove the limitation, of only two properties, that is inherent in the way LaTeX’s reference system works. The package implements an extensible referencing system, where properties may be defined and used in the course of a document. It provides an interface for macro programmers to access the new reference scheme and some applications that use it.

The package is part of the oberdiek bundle.

The author is Heiko Oberdiek. The package is Copyright © 2006-2012 Heiko Oberdiek.