Hi,

The following installs in the repository, and can be used:

"https://raw.githubusercontent.com/james-jw/xq-mustache/master/src/xq-mustache.xqm"
!repo:install(.)


But it does not appear the repo:list() or the UI repository list..
I suspect the issue is the form of the namespace 

module namespace mustache = 'http://xq-mustache';

Regards
/Andy