IEEE STANDARD 1855-2016, IEEE Standard forFuzzy Markup language (FML), is atechnical standard developed by theIEEE Standards Association.[1] FML allows modelling afuzzy logic system in a human-readable and hardware independent way. FML is based on eXtensible Markup Language (XML). The designers offuzzy systems with FML have a unified and high-level methodology for describing interoperable fuzzy systems. IEEE STANDARD 1855-2016 uses theW3CXML Schema definition language to define the syntax and semantics of the FML programs.
Prior to the introduction of FML, fuzzy logic practitioners could exchange information about their fuzzy algorithms by adding to their software functions the ability to read, correctly parse, and store the results of their work in a form compatible with theFuzzy Control Language (FCL) described and specified by Part 7 ofIEC 61131.[2][3]
FML lets people codefuzzy systems through a collection of correlated semantic tags that model the components of a classicalfuzzy controller—such asknowledge base,rule base, fuzzy variables and fuzzy rules. Therefore, the FML tags used to build a fuzzy controller represent the set of lexemes used to create fuzzy expressions. To design a well-formed XML-based language, an a XML schema describes an FML context-free grammar that defines name, type, and attributes that characterized each XML element. However, since an FML program represents only a static view of a fuzzy logic controller, the so-called eXtensible Stylesheet Language Translator (XSLT) changes this static view to a computable version. Indeed, XSLTs modules can convert the FML-based fuzzy controller in a general purpose computer language using anXSL file containing the translation description. At this level, the control is executable for the hardware. In short, FML is essentially composed by three layers:
IEEE 1855 was the first standard sponsored by theIEEE Computational Intelligence Society.