use.id.function boolean use.id.function Use the XPath id() function to find link targets? If 1, the stylesheets use the id() function to find the targets of cross reference elements. This is more efficient, but only works if your XSLT processor implements the id() function, naturally. THIS PARAMETER IS NOT SUPPORTED. IT IS ALWAYS ASSUMED TO BE 1. SEE xref.xsl IF YOU NEED TO TURN IT OFF.