A FUZZY ARDEN SYNTAX COMPILER

The Arden Syntax for Medical Logic Systems is a standard for clinical knowledge representation, maintained by the Health Level Seven (HL7) organization and approved by the American National Standards Institute (ANSI). It offers a wide range of syntactical constructs (various forms of numerical, logical, temporal operators, conditions,.), each of which crisply defines a specific unit of clinical knowledge (yes-no evaluations). As medical conditions and conclusions cannot always be formulated in a strict manner, methods of fuzzy set theory and logic are used to represent uncertainty, which is usually a part of practical clinical knowledge. Based on the extension of Arden Syntax to Fuzzy Arden Syntax by Vetterlein et al. (on the basis of Tiffe's earlier extension), we implemented a Fuzzy Arden Syntax compiler which is able to process a fully fuzzified version of Arden Syntax. We describe the compiler, its components (lexer, parser, and synthesis), and discuss its implementation.