This document, developed by the Rule Interchange Format (RIF) Working Group, specifies a basic format that allows logic rules to be exchanged between rule-based systems.
... This document, developed by the Rule Interchange Format (RIF) Working Group, specifies the interoperation between RIF and the data and ontology languages RDF, RDFS, and OWL.
the same reason, we probably won't see "widely adopted standards", because no single "rules technology" addresses more than a small part of the spectrum of "rules applications".
This document, developed by the Rule Interchange Format (RIF) Working Group, specifies a basic format that allows logic rules to be exchanged between rule-based systems.
This document, developed by the Rule Interchange Format (RIF) Working Group, specifies compatibility of RIF with the Semantic Web languages RDF and RDFS.
"Rules interchanged using RIF may depend on or be used in combination with RDF data and/or RDF Schema or OWL data models. This document, developed by the RIF Working Group, specifies compatibility of RIF with the Semantic Web languages RDF and RDFS."