Hi, I found out that after adding the third-party jar to the classpath as described here (http://docs.basex.org/wiki/XQuery_3.1#Collations), I can finally alphanumeric-sort my map:keys:
map:keys($map_ev) => sort('http://www.w3.org/2013/collation/UCA?lang=de;numeric=yes') Which I like a lot. Are there any plans on having this already shipped with BaseX in future releases? Thanks, Daniel