Subobject and property paths

Relates to https://sourceforge.net/p/semediawiki/mailman/message/36007871/.

[[Name::Example A]]
[[Date::1/1/2018]]

{{#subobject:SubExample
 |count=20
 |value=40
}}

Example A 1/1/2018

{{#ask: [[Name::Example A]]
 |?Date
 |?Has subobject.Count
 |?Has subobject.Value
}}

	Date	Count⠉	Value⠉
Subobject and property paths	1 janvier 2018	20	40