Parses a RuleBlock, restricting which FilterRule kinds may appear.
Pass null for applicability/groupBy.universe (same vocabulary a saved
search filter allows, minus elevation/ref-carrying storey, checked
unconditionally below); pass ELEMENT_REQUIREMENT_KINDS for an
element requirement's block.
Parses a
RuleBlock, restricting whichFilterRulekinds may appear. Passnullfor applicability/groupBy.universe(same vocabulary a saved search filter allows, minuselevation/ref-carryingstorey, checked unconditionally below); passELEMENT_REQUIREMENT_KINDSfor anelementrequirement's block.