Bob DuCharme has written a tutorial explaining how to get XML Schema based type-checking working with the Xerces Java parser.

Condense.xsl, by Mike Brown, is an XSLT stylesheet to strip whitespace and comments. Since the XSLT/XPath data model does not expose the DOCTYPE declaration or entity references to an XSL processor, applying the stylesheet to a document also has the effect of expanding the entity references and removing the DOCTYPE, so it may not be appropriate for all situations.

The author invites others to benchmark the processing times for lengthy stylesheets before and after removal of comments and extraneous whitespace, and to contact him or post to the XSL list their results. He writes, "Depending on the length of the source document, the initial parse time and the time required for the XSL processor to create and prepare to use the stylesheet tree before processing can be reduced by tens or hundreds of precious milliseconds." However, he concedes that his initial benchmarks had a wide margin of error.