The package defines an environment that only typesets specified environments within its scope.

So, for example, if you want nothing but the figure and table environments in your document, you can enclose the whole document with an xcomment environment that excludes everything but. This is a lot easier than excluding the chunks of text between the environments you want, or creating an entire document containing only those environments.

The package was previously part of the seminar bundle for typesetting presentations.

The authors are Timothy Van Zandt and Herbert Voß. The package is Copyright © 2010 Herbert Voss.