scf_next_val
ret = scf_next_val(prop, SCF_TYPE_BOOLEAN);
ret = scf_next_val(prop, SCF_TYPE_COUNT);
ret = scf_next_val(prop, SCF_TYPE_INTEGER);
ret = scf_next_val(prop, SCF_TYPE_TIME);
ret = scf_next_val(prop, SCF_TYPE_ASTRING);
ret = scf_next_val(prop, SCF_TYPE_USTRING);
ret = scf_next_val(prop, SCF_TYPE_OPAQUE);