“This specification defines the Service Modeling Language, Version 1.1 (SML) used to model complex services and systems, including their structure, constraints, policies, and best practices. SML uses XML Schema and Schematron. (…) The Service Modeling Language provides a rich set of constructs for creating models of complex services and systems. Depending on the application domain, these models may include information such as configuration, deployment, monitoring, policy, health, capacity planning, target operating range, service level agreements, and so on. Models provide value in several important ways.” (W3C)