After rules on a document have been executed, Expere must make a decision about how to render the document. There are many different renderers, so some logic must be applied to determine the proper renderer to use for any given document. This is done using a stylesheet that executes against the PackageDoc and returns XML specifying the proper renderer to use. If you are just interested in using Expere with the default configuration, you may just read the next section regarding the basic requirements. If you are interested in changing the way Expere renders the remainder of this topic will be of interest.