Query-based operators

A range of operators use a query as their scope, returning a List-type list of (unique) $Path values.

Such operators are:

• != (i.e. value inequality)
• & (i.e. query logical AND join)
• %matches (query back-references)
• < (i.e. less than)
• <= (i.e. less than or equal to)
• == (i.e. value equality)
• > (i.e. greater than)
• >= (i.e. greater than or equal to)
• | (i.e. query logical OR join)
• $N (query back-reference)
• find(scope)