string  usd_relationshiptargets(<stage>stage, string primpath, string name)
This function returns the list of targets of a given relationship.
When running in the context of a node (such as a wrangle LOP), this argument can be an integer representing the input number (starting at 0) to read the stage from. The integer is equivalent to the string form referencing a particular input, e.g., "opinput:0".
The path to the primitive.
The relationship name.
List of targets in a relationship.
// Get the list of targets in cube's "some_relationship" relationship. string targets = usd_relationshiptargets(0, "/geo/cube", "some_relationship");