Business Process Modeling Language (BPML) is an Extensible Markup Language (XML)-based meta-language developed by the Business Process Management Initiative (BPMI) as a means of modeling business processes.

According to "WhatIs":
BPML includes specifications for ACID transactions and long-running transactions, dataflow, messages and scheduled events, business rules, security roles, and exceptions. BPMI has identified three crucial aspects of BPML capability: because it will be used for mission critical applications, it must support both synchronous and asynchronous distributed transactions; because it will model business processes deployed over the Internet, it must offer reliable security mechanisms; and because it will be used throughout integrated development environments, it must encompass project management capabilities.