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Health Level 7
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===HL7 Version 3=== The HL7 version 3 standard has the aim to support all healthcare workflows.<ref name="V3">{{cite web|title=HL7 V3 Standard - A High Level Overview|date=26 May 2020|url=https://saravanansubramanian.com/hl7V3intro/}}</ref> Development of version 3 started around 1995, resulting in an initial standard publication in 2005. The v3 standard, as opposed to version 2, is based on a formal methodology (the HDF) and object-oriented principles. '''RIM - ISO/HL7 21731''' The Reference Information Model<ref name="RIM">{{cite web|title=HL7 Reference Information Model|url=http://www.hl7.org/implement/standards/rim.cfm|publisher=[[HL7]]}}</ref> (RIM) is the cornerstone of the HL7 Version 3 development process and an essential part of the HL7 V3 development methodology. RIM expresses the data content needed in a specific clinical or administrative context and provides an explicit representation of the [[semantic]] and [[lexicon|lexical]] connections that exist between the information carried in the fields of HL7 messages.<ref>{{cite web|title=Tools & Resources β V3 Modeling & Methodology Tools|url=http://www.hl7.org/participate/toolsandresources.cfm|publisher=[[HL7]]}}</ref> '''HL7 Development Framework - [[International Organization for Standardization|ISO]]/HL7 27931''' The HL7 Version 3 Development Framework (HDF) is a continuously evolving process that seeks to develop specifications that facilitate interoperability between healthcare systems. The HL7 RIM, vocabulary specifications, and model-driven process of analysis and design combine to make HL7 Version 3 one methodology for the development of consensus-based standards for healthcare information systems [[interoperability]]. The HDF is the most current edition of the HL7 V3 development methodology. The HDF not only documents messaging, but also the processes, tools, actors, rules, and artifacts relevant to the development of all HL7 standard specifications. Eventually, the HDF will encompass all of the HL7 standard specifications, including any new standards resulting from the analysis of electronic health record architectures and requirements. HL7 specifications draw upon codes and vocabularies from a variety of sources. The V3 vocabulary work ensures that the systems implementing HL7 specifications have an unambiguous understanding of the code sources and code value domains they are using. '''V3 Messaging''' The HL7 version 3 messaging standard defines a series of Secure Text messages (called ''interactions'') to support all healthcare workflows. HL7 v3 messages are based on an XML encoding syntax, as shown in this example:<ref>{{cite web|editor-last=Spronk|editor-first=RenΓ©|title=HL7 Message examples: version 2 and version 3|url=http://www.ringholm.de/docs/04300_en.htm|work=Ringholm|publisher=Ringholm bv|date=16 November 2007}}</ref>{{rp|2.2.1}} <!--Sample code from Spronk 2007, CC BY-SA 3.0--> <syntaxhighlight lang="xml"><POLB_IN224200 ITSVersion="XML_1.0" xmlns="urn:hl7-org:v3" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <id root="2.16.840.1.113883.19.1122.7" extension="CNTRL-3456"/> <creationTime value="200202150930-0400"/> <!-- The version of the datatypes/RIM/vocabulary used is that of May 2006 --> <versionCode code="2006-05"/> <!-- interaction id= Observation Event Complete, w/o Receiver Responsibilities --> <interactionId root="2.16.840.1.113883.1.6" extension="POLB_IN224200"/> <processingCode code="P"/> <processingModeCode nullFlavor="OTH"/> <acceptAckCode code="ER"/> <receiver typeCode="RCV"> <device classCode="DEV" determinerCode="INSTANCE"> <id extension="GHH LAB" root="2.16.840.1.113883.19.1122.1"/> <asLocatedEntity classCode="LOCE"> <location classCode="PLC" determinerCode="INSTANCE"> <id root="2.16.840.1.113883.19.1122.2" extension="ELAB-3"/> </location> </asLocatedEntity> </device> </receiver> <sender typeCode="SND"> <device classCode="DEV" determinerCode="INSTANCE"> <id root="2.16.840.1.113883.19.1122.1" extension="GHH OE"/> <asLocatedEntity classCode="LOCE"> <location classCode="PLC" determinerCode="INSTANCE"> <id root="2.16.840.1.113883.19.1122.2" extension="BLDG24"/> </location> </asLocatedEntity> </device> </sender> <!-- Trigger Event Control Act & Domain Content --> </POLB_IN224200></syntaxhighlight>
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