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.. _reference.name-based-namespaces:
=====================
Predefined Namespaces
=====================
`RFC 4122`_ defines a handful of UUIDs to use with "for some potentially
interesting name spaces."
.. list-table::
:widths: 30 70
:align: center
:header-rows: 1
* - Constant
- Description
* - :php:const:`Uuid::NAMESPACE_DNS <Ramsey\\Uuid\\Uuid::NAMESPACE_DNS>`
- The name string is a fully-qualified domain name.
* - :php:const:`Uuid::NAMESPACE_URL <Ramsey\\Uuid\\Uuid::NAMESPACE_URL>`
- The name string is a URL.
* - :php:const:`Uuid::NAMESPACE_OID <Ramsey\\Uuid\\Uuid::NAMESPACE_OID>`
- The name string is an `ISO object identifier (OID)`_.
* - :php:const:`Uuid::NAMESPACE_X500 <Ramsey\\Uuid\\Uuid::NAMESPACE_X500>`
- The name string is an `X.500`_ `DN`_ in `DER`_ or a text output format.
.. _RFC 4122: https://tools.ietf.org/html/rfc4122
.. _ISO object identifier (OID): http://www.oid-info.com
.. _X.500: https://en.wikipedia.org/wiki/X.500
.. _DN: https://en.wikipedia.org/wiki/Distinguished_Name
.. _DER: https://www.itu.int/rec/T-REC-X.690/
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