HL7 and XML

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• HL7 and XML
• Prof. Dr. Joachim Dudeck
• Institute of Medical Informatics
• University of Giessen
• Chairman HL7 User Group in Germany
• E-Mail jwd_at_uni-giessen.de

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HL7 and XML

• HL7 - Health Level Seven
• Most frequently used Communication Standard in
  Hospital Information Systems
• International Affiliates in several Countries
• Version 2.3.1 recently published
• Model-based version 3.0 under development

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HL7 and XML

• What has to be standardised
• Semantic Content Abstract Message
• Syntactic Structure Definitions
• Interchange Format Encoding Rules
• Management Rules

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HL7 and XML

• HL7 - Health Level Seven
• Sequence oriented Interchange Format
• Data Items are identified by the position in the
  message
• Disadvantages when representing relationships
  between data items
• Complex data types have been introduced

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HL7 and XML

• HL7 - Health Level Seven
• SIG SGML / XML founded in 1997
• Use of XML as Interchange Format for Messages
• Main concern - length of the messages
• first attempts - use of attributes for
  transmitting message content
• XML as interchange Format of Version 3.x

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HL7 - Version 3
HL7 Reference Model
Common Specs
Future Consideration
Implementable Message Specification ASN.1/ER7
Implementable Message Specification OLE/CORBA
Implementable Message Specification EDIFACT
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The same message in XML (perhaps) 1 of 5

• lt?XML version "1.0"?gt
• lt!DOCTYPE PE SYSTEM "PEopt.dtd" gt
• ltPE T"PE"gt
• ltPEstts T"CNE" cd"a" tx"active" cs"HL7"
  cv"3.11" ot"original
• text"/gt
• ltPEecls T"CNE" cd"te" tx"emergency"
  cs"HL7" cv"3.11"/gt
• ltPEeid T"ST" eid" ENC703421"/gt
• ltPEeip T"NM" eip"2"/gt
• ltPEfsid T"DT" fsid"19970301"/gt
• ltPEpcls T"CNE" cd"I" tx"Inpatient" cs"HL7"
  cv"3.11"/gt
• ltPEstdt T"DT" stdt"1998011110815"/gt
• ltPEIPE T"IPE"gt
• ltIPEedy T"NM" ady"4"/gt
• ltIPEdtm T"DTM" dtm"1998011110815"/gt
• ltIPErsn T"CNE" cd"3" tx" OBSERVATION"
  cs"HL7" cv"3.11"/gt
• ltIPErfl T"CNE" cd"1" tx"PHYS REFERRAL"
  cs"HL7" cv"3.11"/gt
• ltIPEsrc T"CNE" cd"ED" tx"Emergency
  department" cs"HL7" cv"3.11"/gt
• ltIPEtyp T"CNE" cd"I" tx"Inpatient"
  cs"HL7" cv"3.11"/gt
• ltIPEpat T"CNE" cd"N" tx"no" cs"HL7"
  cv"3.11"/gt

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HL7 and XML

• HL7 - Patient Record Architectur (PRA)
• KONA Proposal
• XML Structure of Medical Records
• Three Levels
• Finished Patient Record Header
• First demonstrations at HIMMS 1999

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Overview Theory Practice Implement Provider
HIMSS Map Issues
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HL7 and XML

• HL7 - Future Developments
• HL7 will move to XML in Version 3
• Version 2.x will remain using the traditional HL7
  interchange format
• HL7 has to cope with current initiatives
  (Biztalk, Global XML Framework, HISB Data
  Registry Project etc.)