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Ongoing enhancement and maintenance of the Open Cloud Computing Interface (OCCI) is primarily by way of various registries.

Core

Authentication mechanisms

Mechanism
Basic Authentication
Digest Authentication
IP Address
Kerberos
NTLM
OAuth
SSL/TLS Client Certificates

HTTP status codes

Code	Description	Example
200 OK	Request completed successfully.	Response is returned
201 Created	Request completed successfully, resource was created.	Pointer to new resource returned.
202 Accepted	Request accepted, processing not completed.	Workload starting but not yet active.
301 Moved Permanently	Resource has been assigned a new permanent URI.	Workload migrated to another installation.
302 Found	Resource resides temporarily under a different URI.	Alias pointing to UUID can be updated.
304 Not Modified	Conditional GET on resource that is unchanged.	Client already has the latest version of the resource.
400 Bad Request	Request could not be understood by the server due to malformed syntax.	Invalid request should not be repeated without modifications.
401 Unauthorised	The request requires user authentication.	Client must retry with authentication.
402 Payment Required	The server has refused to fulfill the request.	Credit limit exceeded.
403 Forbidden	The server understood the request, but is refusing to fulfill it.	Attempt to access resource without permission.
404 Not Found	The server has not found the resource	Feed or entry unknown.
405 Method Not Allowed	The method specified is not allowed for the resource.	Attempt to delete an immutable resource.
406 Not Acceptable	The resource is not capable of requested content characteristics.	Requested unsupported output format.
409 Conflict	Request is in conflict with the current state of the resource.	Resource updated by a third-party.
410 Gone	Resource is gone, no forwarding address.	Resource was deleted.
500 Internal Server Error	Server encountered an unexpected condition.	An unknown failure has occurred.
501 Not Implemented	Functionality required to fulfill request is not implemented.	A disabled extension was called.
502 Bad Gateway	An invalid response was received from an upstream server.	The gateway received a malformed response from a node.
503 Service Unavailable	Server is temporarily unable to handle the request.	Server may be overloaded or down for maintenance.
504 Gateway Timeout	No response was received from an upstream server.	The gateway did not receive a response within the timeout period.

Link relations

Relation	Attributes	Description
http://purl.org/occi/state#{transition}	n/a	State transitions

Note: May need to separate atom:link and occi:link if validation fails due to addition of attributes.

Extensions

State control

State	Transitions	Description
aborting	aborted	The resource encountered an error and is aborting
aborted	n/a	The resource encountered an error and has aborted
active	pause, restart, stop, suspend	The resource is active
resuming	aborting, active	The resource is becoming active and restoring state
pausing	aborting, paused	The resource is preparing to refuse new requests
paused	aborting, resume	The resource is refusing new requests
starting	aborting, active	The resource is becoming active
stopped	start	The resource is inactive and has no saved state
stopping	stopped, aborting	The resource is becoming inactive and destroying state
suspended	resume, stop	The resource is inactive and has saved state

Note: Stable states and user transitions in bold.

Resources

Type	Sub-type	Description
compute	physical-machine	Physical machine
compute	virtual-machine	Virtual machine
compute	slice	Virtual private server, container, zone, etc.
network	physical-network	Physical network segment
network	virtual-network	Virtual network segment
network	load-balancer	Load balancer device
storage	drive	Hard disk drive
storage	snapshot	A snapshot of a storage resource at a point in time

Hide Details

	Versions		Associations		Attachments		Back Links

Version	Version Comment	Created By
Version 19	s/workload/compute/	Sam Johnston - 04/19/2009
Version 18	suggestion on changing workload to compute resource	Andy Edmonds - 04/18/2009
Version 17		Sam Johnston - 04/18/2009
Version 16	note about links	Sam Johnston - 04/18/2009
Version 15	added link relations	Sam Johnston - 04/18/2009
Version 14	+snapshot	Sam Johnston - 04/18/2009
Version 13		Sam Johnston - 04/18/2009
Version 12	updated state table	Sam Johnston - 04/18/2009
Version 11	added HTTP status codes	Sam Johnston - 04/18/2009
Version 10		Sam Johnston - 04/18/2009
Version 9	HTTP status codes - 2xx	Sam Johnston - 04/18/2009
Version 8		Sam Johnston - 04/18/2009
Version 7		Sam Johnston - 04/18/2009
Version 6	added authentication types registry	Sam Johnston - 04/18/2009
Version 5	added resources	Sam Johnston - 04/18/2009
Version 4		Sam Johnston - 04/18/2009
Version 3		Sam Johnston - 04/18/2009
Version 2	added state control "state" registry	Sam Johnston - 04/18/2009
Version 1	created	Sam Johnston - 04/18/2009