BPL Defined
UAM defines an integrated set of four viewpoint languages for each perspective: a perspective language. The Business Perspective language is defined in detail in the referenced paper.
Relationships
Main Description

Business Process Language Definition: BPL.pdf

Overview

The Business Perspective Language is based upon a very small subset of BPMN elements, with the addition of business entities, business locations, and business roles elements. The image below summarizes, using UML notation, the language elements and inter-relationships of the UAM Business Perspective language. A more complete summary is available here: BPL Summary.  

UAM Business Perspective Language Summary

The referenced document describes the Business Perspective Language in detail, with each element fully described.