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A service description defines or references the information needed to use, deploy, manage and otherwise control a service. Capabilities to support service metadata includemay be summarized as:

• Versioning, configuration management, and migration tools to enable service description change over time and to reflect changing needs and context
• Semantic metadata, which may be used for categorization or providing other property and value information for service descriptions
• Bindings to policies defining conditions of use and contracts representing agreement on policies and other conditions
• Bindings to metric models to describe the operational characteristics of the subjects being described
• Interaction history to enable auditing and repeatability, thereby establishing a context for results and support for understanding observed change in performance or results
• Service assembly/composition from components
• Up-to-date information on what a resource is, the conditions for interacting with the resource, and the results of such interactions. As such, the service description is the source of vital information in establishing willingness to interact with a resource, reachability to make interaction possible, and compliance with relevant conditions of use.

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