OptionalcontainerThe (optional) required type for the node the direct relation points to. If specified, the node must exist before the direct relation is referenced and of the specified type. If no container specification is used, the node will be auto created with the built-in node container type, and it does not explicitly have to be created before the node that references it.
OptionallistSpecifies that the data type is a list of values. The ordering of values is preserved.
OptionalmaxSpecifies the maximum number of values in the list
Direct node relation