Meta-data

----------

Each entity type has at least the following meta-relations:

eid

~~~

Each entity in *CubicWeb* has an associated identifier which is unique

in an instance. We usually call this identifier `eid`.

`creation_date` and `modification_date`

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Date and time of the creation / lastest modification of an entity.

`created_by`

~~~~~~~~~~~~

relation to the :ref:`users <CWUser>` who has created the entity

`owned_by`

~~~~~~~~~~

relation to :ref:`users <CWUser>` whom the entity belongs; usually the creator but not

necessary, and it could have multiple owners notably for permission control

`is`

~~~~~

relation to the :ref:`entity type <CWEType>` of which type the entity is.

`is_instance`

~~~~~~~~~~~~~

relation to the :ref:`entity types <CWEType>` of which type the entity is an instance of.

Special relations

-----------------

`has_text`

~~~~~~~~~~

query the full text index (only for entities having fulltextindexed attributes)

`identity`

~~~~~~~~~~

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