Fast Formal Facts About SML
The Service Modeling Language (SML) is a language for building a rich set of constructs for creating and constraining models of complex IT services and systems. SML-based models could include information about configuration, deployment, monitoring, policy, health, capacity planning, target operating range, service level agreements, and so on.
An SML model is a set of interrelated XML documents. An SML model could contain information about the parts of an IT service, as well as the constraints that each part must satisfy for the IT service to function properly. Constraints are captured in two ways:
- XML Schema documents
- constrain the structure and content of the XML instance documents in a model. SML uses XML Schema 1.0, but allows later versions as well. SML also defines a set of extensions to XML Schema to constrain references, and identity constraints (key, unique, ...) that apply to sets of documents.
- Rule documents
- constrain the structure and content of documents in a model. SML uses Schematron and XPath 1.0 for rules, but allows later versions as well.
Once a model is defined, one of the important operations on the model is to establish its validity. This involves checking whether all model documents satisfy the XML Schema and rule document constraints.
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