1 

     2 Metadata

     3 --------

     4 

     5 .. index::

     6    schema: meta-data;

     7    schema: eid; creation_date; modification_data; cwuri

     8    schema: created_by; owned_by; is; is_instance;

     9 

    10 Each entity type in |cubicweb| has at least the following meta-data attributes and relations:

    11 

    12 `eid`

    13   entity's identifier which is unique in an instance. We usually call this identifier `eid` for historical reason.

    14 

    15 `creation_date`

    16   Date and time of the creation of the entity.

    17 

    18 `modification_date`

    19   Date and time of the latest modification of an entity.

    20 

    21 `cwuri`

    22   Reference URL of the entity, which is not expected to change.

    23 

    24 `created_by`

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

    26 

    27 `owned_by`

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

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

    30 

    31 `is`

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

    33 

    34 `is_instance`

    35   Relation to the :ref:`entity types <CWEType>` of which type the

    36   entity is an instance of.

    37