Can you help me with the meaning of 形成的身份行为 and 要式行为?? Thank you!! I'm talking about marriage law, in particular divorce involving property donation and children foster. In this sentence, how can I translate 形成的身份行为 and 要式行为?? Thank you all! 离婚协议是一个复合协议，既包括解除婚姻关系的形成行为，也包括夫妻财产分割及子女抚养的附随行为。形成的身份行为为要式行为，未经登记不生效。