Implement FEEL/DMN value marshaller ----------------------------------- Key: DROOLS-1551 URL: https://issues.jboss.org/browse/DROOLS-1551 Project: Drools Issue Type: Feature Request Components: dmn engine Affects Versions: 7.0.0.CR3 Reporter: Edson Tirelli Assignee: Edson Tirelli Priority: Critical Some value types in FEEL/DMN require special formatting when marshalling/unmarshalling. For instance: {quote} So it seems that ISO 8601 does not define negative intervals. I.e., ISO 8601 only supports things like "PT1H". XPath extends that with a leading optional sign, like "+PT1H" and "-PT1H". Java extends that allowing the sign to be used in each of the units in the duration like, "PT+1H", "PT-1H", besides the leading sign "-PT1H". The FEEL spec on page 113 seems to follow the XPath lexical definition, so the leading sign "-PT1H" seems to be the correct format. {quote} Implement an object marshaller for DMN/FEEL that is capable of marshalling/unmarshalling objects. Most object types are straightforward, but a few of them (like durations) need special handling. In particular: * negative duration should use a leading - sign instead of having the sign in the unit numbers * durations need to be normalized before marshalled: {quote} A days and time duration in the semantic domain is a sequence of numbers for the days, hours, minutes, and seconds of duration, normalized such that the sum of these numbers is minimized. {quote}