IHE給出了各個Actor之間如何通訊的建議： 1.??????應用程序通訊時必須用MLLP包裝或者解析。 2.??????客戶端建立連接后，服務器端必須用此連接進行應答。客戶端可以繼續用此連接啟動新事務 原文如下： 1.?????Applications shall use the Minimal Lower Layer Protocol defined in Appendix C of the HL7 Implementation Guide. 2.?????An initiating application that wants to send a message (initiate a transaction) will initiate a network connection to start the transaction. The receiver application will respond with an acknowledgement or response to query over the open connection. The initiating application can initiate a new transaction on the same connection. However, the initiating application must be able to handle cases where the connection has been closed due to possible timeout by the accepting application. For example if the initiating application does not submit a request over the connection in a timely manner, the accepting application has the right to close the connection. When this condition is detected, the initiating application needs to open a new connection for subsequent requests. 在實現消息解析時，請參考IHE_ITI_TF_Rev8-0_Vol2a_FT_2011-08-19的3.8，3.9，3.10以及IHE_ITI_TF_Rev8-0_Vol2x_FT_2011-08-19的Appendix C 有必選Segment，以及每個Segment必選element,其中 RRequired R2This is an IHE extension. If the sending application has data for the field, it is required to populate the field. If the value is not known, the field may not be sent. R+This is an IHE extension. This is a field that IHE requires that was listed as optional within the HL7 standard. OOptional CConditional 總共是8個必選Segment，但是對于具體事務有些Segment可以不關心，比如Feed不太關心PV1. [...]表示“可選” {…}表示“可重復” [{…}]表示“可選，且可重復” PIX總共包括3個事務：Feed，Query，Update，HL7版本分別為v2.3.1， V2.5， v2.5. Feed包括：A01，A04，A05，A08。MessageType為ADT，A01-A08， ADT_A01. 以及A40，MessageType為ADT，A40， ADT_A39 Query包括：Q23，K23 Update: A31 在PIX中需要對域進行配置， 有幾個概念需要澄清。 病人標識源： 就是ADT消息的SendingApplication字段。 病人標識域： 病人交叉索引域：?