Structured annotations are allowed (property=value) URI or roots? refinement-id, node-id or some other suitable scoping node within the outer scope which a restricted refinement applies to Statement - node pattern in node grammar - may refer to variables. Condition under which refinement can be used. True by default if not specified. Condition under which issue is included. True by default. Or Parents? Normally a single parent or no root. Exceptionally may have several parents. Parents are other nodes in the model. An integer. Unique within scope of the refinement it is within Condition under which constraint applies or must hold. True by default.