1. A data management method for a network, comprising: automatically determining whether a first record in a database is updated, wherein content of the first record is organized in a hierarchical structure; automatically determining which of a group of clients is affected by update of the first record; automatically determining a data format corresponding to one affected client; automatically generating a message by modifying the hierarchical structure according to the data format; and automatically transmitting the message comprising the result of modifying the hierarchical structure to the affected client quotation master, an order manager, an order price checker, and a manufacturing execution system, wherein the system enterprise application integration agent is implemented in a semiconductor foundry, wherein the content of the first record is classified into objects comprising the hierarchical structure, in which a descendent object belongs to an ascendant object, and at least one object is removed from the hierarchical structure after modification thereof, and wherein the hierarchical structure conforms to a self-describing format wherein each of the objects is delimited by a pair of tags annotating characteristics of the delimited object.