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FHIR builds on previous data format standards from HL7, like HL7 version 2.x and HL7 version 3.x. But it is easier to implement because it uses a modern web-based suite of API technology, including a HTTP-based RESTful protocol, and a choice of JSON, XML or RDF for data representation. [1]
The HL7 version 3 standard has the aim to support all healthcare workflows. [8] 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 HL7 Clinical Document Architecture (CDA) is an XML-based markup standard intended to specify the encoding, structure and semantics of clinical documents for exchange. In November 2000, HL7 published Release 1.0. The organization published Release 2.0 with its "2005 Normative Edition". [1]
[1] [2] Furthermore, interconnection between medical devices and medical information systems is enabled. [3] However, IEEE 11073 SDC does not compete with established and emerging standards like HL7 v2 or HL7 FHIR. [4] IEEE 11073 SDC is part of the established ISO/IEEE 11073 family of standards.
The HL7 Consolidated Clinical Document Architecture (C-CDA) is an XML-based markup standard which provides a library of CDA formatted documents. Clinical documents using the C-CDA standards are exchanged billions of times annually in the United States.
HL7 version 2 is used by almost all Swiss hospitals. Their HL7 v3 CDA implementation guide covers all documents needed to support the "hip replacement" clinical pathway. Parametrix, the biggest medical information system vendor in Switzerland has been using a RIM based architecture. [16]
HL7 was founded in 1987 to produce a standard for the exchange of data with hospital information systems.Donald W. Simborg, the CEO of Simborg Systems took the initiative to create the HL7 organization with the aim to allow for wider use of its own exchange protocol (known as the StatLAN protocol, originally defined at the University of California, San Francisco in the late 1970s).
In healthcare, HL7 has been in use for over thirty years (which predates the internet and web technology), and uses the pipe character (|) as a data delimiter. The current internet standard for document markup is XML, which uses "< >" as a data delimiter. The data delimiters convey no meaning to the data other than to structure the data.