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TOSCA defines three concepts for Policy: Policy Type, Policy, and Trigger.
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1. Policy Type
A Policy Type is used to specify the types of policies that may be used in a service. The parameter definitions for a policy of this type, the entity types to which it applies, and what triggers policies of this type may be specified.
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- its properties, which define the values of the configuration parameters that the policy takes
- its targets, which define the node types and/or groups group types to which the policy type applies
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