EXSLT is a community initiative to provide extensions to XSLT. The extensions are broken down into a number of modules, listed below. We are trying to encourage the implementers of XSLT processors to use these extensions, so that your stylesheets can be more portable. If your XSLT processor doesn't support a particular extension, you can download packages that you can use to provide functions or templates for your stylesheets. Have a look at the How To... page for more details about how to use the packages.