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−.. _CWBaseEntityTypes:
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−
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−Pre-defined entities in the library
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−-----------------------------------
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−
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−The library defines a set of entity schemas that are required by the system
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−or commonly used in *CubicWeb* instances.
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−
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−
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−Entity types used to store the schema
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−~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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−* _`CWEType`, entity type
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−* _`CWRType`, relation type
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−* _`CWRelation`, relation definition
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−* _`CWAttribute`, attribute relation definition
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−* _`CWConstraint`,  `CWConstraintType`, `RQLExpression`
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−
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−Entity types used to manage users and permissions
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−~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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−* _`CWUser`, system users
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−* _`CWGroup`, users groups
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−* _`CWPermission`, used to configure the security of the instance
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−
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−Entity types used to manage workflows
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−~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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−* _`Workflow`, workflow entity, linked to some entity types which may use this workflow
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−* _`State`, workflow state
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−* _`Transition`, workflow transition
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−* _`TrInfo`, record of a transition trafic for an entity
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−
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−Other entity types
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−~~~~~~~~~~~~~~~~~~
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−* _`CWCache`, cache entities used to improve performances
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−* _`CWProperty`, used to configure the instance
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−
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−* _`EmailAddress`, email address, used by the system to send notifications
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−  to the users and also used by others optionnals schemas
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−
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−* _`Bookmark`, an entity type used to allow a user to customize his links within
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−  the instance
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−
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−* _`ExternalUri`, used for semantic web site to indicate that an entity is the
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−  same as another from an external site