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Event-Driven Data Exchange in XDS-b: A Comprehensive Guide to Pub/Sub Implementation

This white paper provides a detailed overview of event-driven data exchange using the Publish/Subscribe model within the context of XDS-b. It explores the purpose, structure, and actors involved in event notifications, including transactions and filters. Highlighting cross-enterprise use cases, the paper presents essential concepts, detailed transaction descriptions, and standards like WS-Eventing and ebXML. With its strong focus on practicality, this document paves the way for effective implementation and integration of the Pub/Sub mechanism for enhanced data coordination in healthcare settings.

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Event-Driven Data Exchange in XDS-b: A Comprehensive Guide to Pub/Sub Implementation

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  1. Publish Subscribe for XDS-b Vassil Peytchev Epic Systems Corporation

  2. Overview • Purpose • Structure • Actors • Transactions • Filters • Next steps

  3. Purpose of the white paper • Event-driven data exchange • Coordination of event notifications • Cross-enterprise use cases • Why a white paper?

  4. Pub/Sub for XDS-b • Cross-enterprise focus • “Trial specification” • Implementable detail

  5. White Paper Structure • Present general concepts • Link concepts to XDS-b • Present overall transaction flow • Detailed transaction descriptions

  6. Choosing a standard • WS-Eventing • WS-Notification • ebXML Registry Services

  7. Publish/subscribe actors • Subscriber • Notification Broker • Notification Consumer • Publisher • Possible actor groupings

  8. Actors and Transactions

  9. Transactions • Subscribe • Request notifications for a particular type of event • Event is described as a filter based on topics • Notify • Send a notification about a specific event

  10. Subscribe • Sent on behalf of a Notification Consumer • Used to • Initiate a subscription • Modify a subscription • Terminate a subscription • Contents described later

  11. Notify • Send to Notification Consumer • Contains • Document Unique ID • Optionally Home Community ID • A document consumer needs to query the registry, and retrieve the document

  12. Subscription Request Contents • Topics and filter expressions • Stored query expressions • Patient-centric queries only • All parameters must match • At least one of the values of a multi-valued parameter must match

  13. Example • Stored Query <rim:AdhocQuery id="urn:uuid:14d4debf-8f97-4251-9a74-a90016b0af0d" xmlns:rim="urn:oasis:names:tc:ebxml-regrep:xsd:rim:3.0"> <rim:Slot name="$XDSDocumentEntryPatientId"> <rim:ValueList> <rim:Value>'st3498702^^^&1.3.6.1.4.1.21367.2005.3.7&ISO'</rim:Value> </rim:ValueList> </rim:Slot> <rim:Slot name="$XDSDocumentEntryEventCodeList"> <rim:ValueList> <rim:Value>('44950' '44955' '44960' '44970' '44979')</rim:Value> </rim:ValueList> </rim:Slot> </rim:AdhocQuery>

  14. Example (continued) • Registry submission <rim:RegistryObjectList> <rim:ExtrinsicObject id="Document01" mimeType="text/xml" objectType="urn:uuid:7edca82f-054d-47f2-a032-9b2a5b5186c1"> ... <rim:Classification classificationScheme="urn:uuid:2c6b8cb7-8b2a-4051-b291-b1ae6a575ef4" classifiedObject="Document01" nodeRepresentation="44950"> <rim:Name> <rim:LocalizedString value="Appendectomy"/> </rim:Name> <rim:Slot name="codingScheme"> <rim:ValueList> <rim:Value>CPT codes</rim:Value> </rim:ValueList> </rim:Slot> </rim:Classification> ... <rim:ExternalIdentifier id="ei01" registryObject="Document01" identificationScheme="urn:uuid:58a6f841-87b3-4a3e-92fd-a8ffeff98427" value="'st3498702^^^&amp;1.3.6.1.4.1.21367.2005.3.7&amp;ISO'"> <rim:Name> <rim:LocalizedString value="XDSDocumentEntry.patientId"/> </rim:Name> </rim:ExternalIdentifier> ... <rim:ExtrinsicObject> </rim:RegistryObjectList>

  15. Example (Continued) • Subscribe request <wsnt:Subscribe> <!-- The Consumer on whose behalf the subscription is requested - the address where the notification is to be sent --> <wsnt:ConsumerReference> <a:Address>https://NotificationConsumerServer/xdsBnotification</a:Address> </wsnt:ConsumerReference> <wsnt:Filter> <wsnt:TopicExpression Dialect="urn:ihe:iti:xds-b:pubsub:2008"> <rim:AdhocQuery id="urn:uuid:14d4debf-8f97-4251-9a74-a90016b0af0d"> <rim:Slot name="$XDSDocumentEntryPatientId"> <rim:ValueList> <rim:Value>'st3498702^^^&1.3.6.1.4.1.21367.2005.3.7&ISO'</rim:Value> </rim:ValueList> </rim:Slot> <rim:Slot name="$XDSDocumentEntryEventCodeList"> <rim:ValueList> <rim:Value>('44950' '44955' '44960' '44970' '44979')</rim:Value> </rim:ValueList> </rim:Slot> </rim:AdhocQuery> </wsnt:TopicExpression> </wsnt:Filter> <wsnt:InitialTerminationTime>2008-07-31T00:00:00.00000Z</wsnt:InitialTerminationTime> </wsnt:Subscribe>

  16. Next steps • Implementable white paper • Connectathon participation • Feedback • Refinement • Path to a profile • ITI integration profile • Multiple content profiles for filters

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