Standards

BPMN — Business Process Model and Notation

• Bruce Silver, BPMN Method and Style
• OMG BPMN specification

DMN — Decision Model and Notation

• DMN LinkedIn Group
• OMG DMN specification

JSR-331 — Java Constraint Programming API

• JSR-331 specification

JSR-94 — Rule Engine Java API

• JSR-94 specification

Related Methodologies

• RuleSpeak, by Ronald G. Ross
• The Decision Model (TDM)

RuleML and RIF

• RIF Working Group (W3C)
• RuleML

SBVR — Semantics of Business Vocabulary and Business Rules

• OMG SBVR specification

A couple of dead links from the original Standards page (the IIBA BABOK guide page and an OpenRules TDM primer page) were dropped rather than migrated — both now 404.