Health Level Seven Arden Syntax for Medical Logic Systems v2.10-2014 (R2019)

Arden syntax is a markup language used to represent medical and scientific knowledge. This syntax is used in an executable format by clinical decision support systems to share medical knowledge within and across health service institutions. This document details Arden syntax for clinical decision support systems used by clinicians, knowledge engineers, administrators and others to improve the quality and safety of care.

Main sections:

· Terminology

· Significance and use

· MLM format

· Slot descriptions

· Structured slot syntax

· Data types

· Operator descriptions

· Logic slot

· Data slot

· Action slot

· Evoke slot

· Formal representation

· Reserved words

· Special symbols

· Operator precedence and associativity

· Format specification

· Objects in Arden syntax

· Language and country codes for HL7 in international affiliate countries

· Sample MLMs

· Summary of changes