Filters are have results they will return: ALLOW, DENY, and ABSTAIN.
- ALLOW means that the filter specifically allows the query
- DENY means that the filter specifically denies the query
- ABSTAIN means none of the filters queried have any opinion on the subject. Abstain is usually interpreted as ALLOW when casting to a single boolean.
Most consumers of filters will cast the query result to a boolean, where ALLOW and ABSTAIN are both interpreted as ALLOW.