Schematron file location for concept task topic glossentry
If you create schematron files for concept, task, topic, or glossentry, the documentation indicates that you put the doctype.sch in the Arbortext\doctypes folder. This is extremely vague, as the real location of the file goes in your Arbortext\application\com.arbortext.dita\doctypes\document_type folder. At least the former did not work for me, perhaps someone has had a different experience. Since this works for Arbortext\application\com.arbortext.dita\doctypes\bookmap\bookmap.sch and Arbortext\application\com.arbortext.dita\doctypes\map\map.sch, my assumption was that this should also work for concept, task, etc.
Also, all of the xsd files fall under Arbortext\application\com.arbortext.dita\doctypes\oasis\technicalContent\xsd, and placing schematron files there does not work either.
Arbortext only provides instructions for specifying your schematron file by using their Architect tool. You would have to have consumed the Arbortext_path\doctypes\readme.txt, which describes the various document types and how they are categorized under ditabase to know this.
I happened to stumble on a clue in the ACL Reference guide under "set newlist", where there is a chart displaying which doc type falls under the corresponding Arbortext command value, and the chart indicates ditabase is the doc type for all DITA doc types (other than maps). Therefore, for concept, task, etc., you must use ditabase.sch under Arbortext_path\application\com.arbortext.dita\doctypes\ditabase.