Ok, so the seemingly straightforward ASK I am now using for the root pages of namespace XYZ:
{{#ask: [[XYZ:+]] [[!~*/*]] | format=ol }}
... is finding multiple "smw-subobject-entity" results of types "#_ERR" and "#_QUERY" for subobjects entries in the results...
For example:
... <ol> <li data-sortkey="D"><span class="smw-subobject-entity"><a href="/smw/XYZ:Article_X#_ERR26432691520be474d2ee0b565c4c00d7" title="XYZ:Article X">Article X</a></span></li> <li data-sortkey="D"><span class="smw-subobject-entity"><a href="/smw/XYZ:Article_X#_ERR541cdfc781e4779b85328be21d3c5ce4" title="XYZ:Article X">Article X</a></span></li> <li data-sortkey="D"><span class="smw-subobject-entity"><a href="/smw/XYZ:Article_X#_ERR92d41ba15db86fd2736de76842b7cc00" title="XYZ:Article X">Article X</a></span></li> <li data-sortkey="E"><span class="smw-subobject-entity"><a href="/smw/ XYZ:Event_Calendar#_QUERY9b613749f7d12a6843f29c2d56e4c5bb" title=" XYZ:Event Calendar">Event Calendar</a></span></li> <li data-sortkey="E"><span class="smw-subobject-entity"><a href="/smw/ XYZ:Event_Calendar#_QUERY904ebdec1781f6cb8a4608884c2286d9" title=" XYZ:Event Calendar">Event Calendar</a></span></li> <li data-sortkey="E"><span class="smw-subobject-entity"><a href="/smw/ XYZ:Event_Calendar#_QUERY6b0d2eacdb40fd2fc1f81a0c6adb2af7" title=" XYZ:Event Calendar">Event Calendar</a></span></li> ...
Is that supposed to be?
-Rich