The xspace package provides a single command that looks at what comes after it in the command stream, and decides whether to insert a space to replace one "eaten" by the TeX command decoder. The decision is based on what came after any space, not on whether there was a space (which is unknowable): so if the next thing proves to be punctuation, the chances are there was no space, but if it's a letter, there's probably a need for space. This technique is not perfect, but works in a large proportion of cases.
The authors are David Carlisle and Morten Høgholm. The package is Copyright © 2004-2006 David Carlisle, Morten Høgholm.
License: lppl Version: 1.13 Catalogued: 2012-06-08