XMLDB Editor and Reserved Names One (of the many) good reasons to use the XMLDB editor in Moodle rather than hacking the db/install.xml file directly is that it warns you if you use a reserved name. For example: The red Reserved text after [XML] in the screenshot is indicating that the word column is reserved and shouldn’t be used. It would be nice if it stopped you from saving such a change (it doesn't) but at least it indicates a problem. The Reserved link points to the following location if you ever want to look up the currently used reserved words: /admin/tool/xmldb/index.php?action=view_reserved_words This link also shows you potential existing problems in your XMLDB that may need to be fixed.