Web Services Transactions

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Presentation transcript:

Web Services Transactions Vassil Peytchev, Epic

WS Overview What are Web Services? Why Web Services transactions? SOAP XML transactions WSDL description of services Why Web Services transactions? Improve ease of implementation Common transaction infrastructure Built-in security Extensibility Long term benefits, long term plans

2006 – 2007 use of WS PIX/PDQ HL7 V3 XDS Stored Query White Paper on WS Roadmap? Versions of standards SOAP 1.1 (possibly SOAP 1.2 binding as an option) WSDL 1.1 WS-I Basic Profile 1.1 WS-I SOAP Binding 1.0 WS-Addressing

How to incorporate WS transactions in the ITI framework Add the WS requirements to the individual transactions Add the WS requirements as separate transactions Provide WS requirements in an Appendix. Mix and match

Current approaches ATNA specifies the syslog transport mechanism by referring to the RFCs Transactions in XDS include the SOAP envelope and describe protocol binding HL7 V2.x transactions don’t specify an underlying protocol (assume HL7 MLLP)

Specific Approaches: PDQ/PIX PDQ/PIX – reuse the HL7 WS profile Basic Profile – very simple SOAP envelope Addressing profile – adds end-point information Security profile – future use (currently security is handled through ATNA) Include the SOAP requirements within the transaction description Wrapper in V3 – is it stable enough? Add WSDL in an Appendix

Example – Basic Profile <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap="..." xmlns:hl7="..." ...> <soap:Body> <PRPA_IN101201 xmlns="urn:hl7-org:v3"> ... </PRPA_IN101201> </soap:Body> </soap:Envelope>

Example: Adding Addressing <soap:Envelope ...> <soap:Header> <wsa:MessageID> uuid:aaaabbbb-cccc-dddd-eeee-ffffffffffff </wsa:MessageID> <wsa:ReplyTo> <wsa:Address>http://placerlocation/PRPA_AR101201 </wsa:Address> </wsa:ReplyTo> <wsa:To>http://fulfillerlocation/PRPA_AR101202</wsa:To> <wsa:Action>urn:hl7-org:v3:PRPA_IN101201</wsa:Action> ... </soap:Header> <soap:Body> <PRPA_IN101201 xmlns="urn:hl7-org:v3" ...> ... </PRPA_IN101201> </soap:Body> </soap:Envelope>

Specific Approaches: XDS Stored Query Starting point: WSDL for ebXML registry services v 3.0 Constrain to only XDS Stored Query Constrain to satisfy WS-I Basic Profile Add WS-Addressing constraints Bring in line with the PDQ/PIX approach Keep the SOAP requirements as part of the transaction Add constrained WSDL to an Appendix