GET'> PUT'> POST'> DELETE'> '> '> ]> The API extensions augment the core API. An API extension extends one or more of the following components of the core API: Resources. An extension defines new object classes. Attributes. An extended attribute defines a new attribute on existing resources. Prefixed by the extension name. Actions. An extended action defines a new operation on an existing resource. Generic API extensions are not plug-in-specific. For information about plug-in-specific extensions that are shipped with OpenStack Networking, see the extension documentation in the source code tree.