MMT should provide information on multi-word concepts
The following is about a file in smglom repository.
Concept http://mathhub.info/smglom/smglom/rootmeansquare.en.omdoc?rootmeansquare.en?rootmeansquare is defined in rootmeansquare.en.tex as \defiii[rootmeansquare]{root}{mean}{square} and should be referenced as trefiii[rootmeansquare]{root}{mean}{square}.
If MMT is requested to give me more information about this symbol by doing the request: "/:mmt?get%20"+uri+"?%20%20present%20xml%20respond" where URI = http://mathhub.info/smglom/smglom/rootmeansquare.en.omdoc?rootmeansquare.en?rootmeansquare, it gives me back:
http://mathhub.info/smglom/smglom/rootmeansquare.de.omdoc?rootmeansquare.de?rootmeansquare
<constant name="rootmeansquare">
</constant>
<div xmlns:jobad="http://omdoc.org/presentation" xmlns="http://www.w3.org/1999/xhtml"><div><span class="keyword folder" onclick="$('#generated_1').toggle()">theory </span><math jobad:component="" jobad:owner="" xmlns:jobad="http://omdoc.org/presentation" xmlns="http://www.w3.org/1998/Math/MathML"><mstyle displaystyle="true"><mo jobad:href="http://mathhub.info/smglom/smglom/rootmeansquare.de.omdoc?rootmeansquare.de" jobad:mmtsrc="" jobad:mmtref="0">rootmeansquare.de</mo></mstyle></math><table id="generated_1" class="decllist foldee" cellpadding="5px"><tr class="omdoc-structure"><td valign="top">include</td><td class="operator" valign="top">:</td><td jobad:load="http://mathhub.info/../smglo/sTeX/arithmetics.omdoc?arithmetics"><span jobad:flattenable="true">http://mathhub.info/../smglo/sTeX/arithmetics.omdoc?arithmetics</span><div class="flat-container" style="display:none"><div></div></div></td></tr><tr><td></td><td><table></table></td></tr><tr class="omdoc-structure"><td valign="top">include</td><td class="operator" valign="top">:</td><td jobad:load="http://mathhub.info/../smglo/sTeX/equal.omdoc?equal"><span jobad:flattenable="true">http://mathhub.info/../smglo/sTeX/equal.omdoc?equal</span><div class="flat-container" style="display:none"><div></div></div></td></tr><tr><td></td><td><table></table></td></tr><tr class="omdoc-structure"><td valign="top">include</td><td class="operator" valign="top">:</td><td jobad:load="http://mathhub.info/smglom/smglom/rootmeansquare.omdoc?rootmeansquare"><span jobad:flattenable="true">http://mathhub.info/smglom/smglom/rootmeansquare.omdoc?rootmeansquare</span><div class="flat-container" style="display:none"><div></div></div></td></tr><tr><td></td><td><table></table></td></tr><tr class="omdoc-symbol"><td>rootmeansquare</td></tr></table></div></div>
From here I cannot deduce that when the editor needs to reference this symbol, it should use trefiii but not trefii or trefi.