Shown below, the BooleanFilter Condition slot has a Filter subproperty containing the NEQL predicate which queries objects in the station for the tags: hs:equip or hs:chiller. If the query returns "true" for any object (as having one of more of the queried tags), then the validity criteria has been met. So the parent definition's tag(s) and/or relation(s) become implied for those objects.