In Utilities/guidelines.xsl.model, I see this: xmlns:pantor="http://www.pantor.com/ns/local" and something similar in the following files: Query/simplify.xsl Utilities-1/colorsvg.xsl Utilities-1/divsplit.xsl Utilities-1/generate-label.xsl Utilities-1/guidelines-latex.xsl Utilities-1/guidelines-print.xsl Utilities~1/guidelines.xsl.model Utilities~1/odd2ebnf.xsl Utilities~1/odd2exodd.xsl Utilities~1/rng2ebnf.xsl Utilities~1/split.xsl Utilities/guidelines-print.xsl Sometimes it maps to the prefix "pantor" and sometimes to the prefix "local". pantor.com seems to be some kind of electronic stock trading platform: http://www.pantor.com/ The Stylesheets repo contains a file called RngToRnc.xsl, which is an ancient stylesheet apparently dating back to 2002, last edited by Syd in 2010. But this does not appear to use the pantor: or local: prefixes, and neither prefix seems to be actually used anywhere. Does anyone have any recollection of what was going on here? If we're not using this namespace, it would be good to get rid of it, especially since it's usually rather confusingly mapped to the prefix "local". Cheers, Martin