 The designers of fuzzy systems with FML have a unified and high-level methodology for describing interoperable fuzzy systems.IEEE STANDARD 1855–2016 uses the W3C XML 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 result of their work in a  form compatible with the Fuzzy Control Language (FCL) described and specified by Part 7 of IEC 61131.