The package provides an interface whereby LaTeX 2e users may use the key-value functions provided in the LaTeX 3 kernel distribution.

The key-value system implemented is more similar to that of pgfkeys than to any other extant package.

The package on CTAN derives from a snapshot of the LaTeX 3 repository, taken on 2013-07-12, and is distributed as part of the l3packages bundle.

The author is The LaTeX Team. The package is Copyright © 2009,2011 The LaTeX3 project.