Biztalk Server 2004 Business Rule Engine Basic concepts

Basic concepts BRE
Facts are the entities that your rules consume and manipulate – examples include an element that appears in an XML document, a column in a database table, or even a method exposed by a .NET component.
A vocabulary is a collection of facts, and its purpose is both to apply meaningful, user-defined definition names to those facts and to provide a unit of versioning
A rule is a statement that defines the behavior of one aspect of a business process. rules are made up of facts, conditions and actions.
A policy is a set of rules, packaged and versioned as a unit. Policies are what you develop, test, and deploy when working with the Business Rules Framework