Specifies the name of any attribute, such as is_product or platform.
Specifies the object reference form of any object version:
Specifies the search order. If the value depth is used for the order_spec, the value indicates that a depth-first search is done. breadth is used to specify a breadth-first search. If the value "none" is used for the order_spec, it indicates that the order is not significant and the search can be done in any order (the fastest method is used).
Specifies the name of a permission such as read or write.