RIF-FRD: A RIF dialect based on fuzzy sets

RIF (Rule Interchange Format) has become W3C's candidate recommendation on rule interchange. To let RIF represent and interchange fuzzy knowledge in the Semantic Web, we propose RIF-FRD (RIF Fuzzy Rule Dialect), a rule interchange format based on fuzzy sets, defining its XML syntax and metamodel. Based on the metamodel, we propose a fuzzy RIF framework—f-RIA (fuzzy Rule Interchange Architecture), which supports rule interchange between RIF-FRD and some important fuzzy rule languages.