curl -g "http://osmxapi.hypercube.telascience.org/api/0.5/*[osm:user=$username]" \
| grep '<tag ' | sed -E "s/<tag k='(.*(name|ref)|note|ele|layer|is_in)' v=.*\/>/<tag k=\'\1\' v='*'\/>/" \
| sort | uniq -c

Example output (shortened):

 117     <tag k='bicycle' v='yes'/>

1075     <tag k='highway' v='footway'/>

 489     <tag k='highway' v='track'/>

 268     <tag k='highway' v='unclassified'/>

  72     <tag k='landuse' v='farm'/>

 284     <tag k='marked_trail' v='blue'/>

 435     <tag k='name' v='*'/>

  18     <tag k='natural' v='wood'/>

 199     <tag k='route' v='ski'/>

 118     <tag k='source' v='survey'/>

 151     <tag k='tracktype' v='grade4'/>

   9     <tag k='trail_visibility' v='intermediate'/>