"Faceted autocomplete"

Ontoquest autocomplete functionality, as described in (https://confluence.crbs.ucsd.edu/display/NIF/OntoQuestMain#OntoQuestMain-9), indicates that URLs of the form
http://nif-services.neuinfo.org/ontoquest/keyword/glia can be used for autocompletes.

For a "faceted autocomplete" search feature suggested for Monarch, it would be great to specify autocomplete across multiple types of data, with matching items to be grouped by specified types.

For example,

http://nif-services.neuinfo.org/ontoquest/keyword/gli?facet=gene&facet=disease&facet=phenotype (or some similar construction)

might return results of a form like:
<data>
<result>
<source>Gene</source>
<term>gli1</term>
<term>gli2</term>
....
</result>
<result>
<source>disease</disease>
<term> ...</term>
<term>... </term>
</result>
....
</data>