Should be contained within a bindings element. A binding is used to bind a variable to a node. Like the triple element in syntax, it can be used to bind a particular property of a matched node to a particular variable name. That name can then be used within the action of a rule.

Properties and Methods inherited from XUL Element

The object of a binding. It can be a variable reference, an RDF node URI, or an RDF literal value.

The predicate or property to match. This must be a URI of the property.

The subject of a binding. It can be a variable reference, an RDF node URI, or an RDF literal value.