[basex-talk] Adding non ".xml" file extension XML files

I'm trying to add a collection of files which are all valid XML but when I'm doing the add with this command:

db:add("db", "/data/xml/docs/", "docs")

where /data/xml/docs contains a number of XML files with a .s9ml file extension, nothing gets added to the database, however if I rename that file.xml, it works. Is there somewhere I can set what file extensions should be used? I can't seem to find anything in any of the docs about this.

Thanks, Joe