Predicate: secretion
Roleset id: secretion.01 , Release substance, vncls: , framnet:
secretion.01: ~secrete.01
Roles:
        Arg0: Secreting entity
        Arg1: Secreted substance (if the rel itself is the substance, it is not eventive)
Example: Both args
        person: ns,  tense: ns,  aspect: ns,  voice: ns,  form: ns
        The liver's importance to the digestive system is its secretion of bile salts.
        Arg0: its
        Rel: secretion
        Arg1: of bile salts