The expected result of checking. If the actual result matches the value specified by @flag, the child elements will be processed.
The type of relationship you want the querying model element to contain.
The types of relationship you want the querying model element to contain. If @modelType is specified, @modelTypes will be ignored.
Check if the querying model element belongs to a specific end of a relationship. Possible values: all, from, to, self_begins, self_ends