OSID - osid.sequencing.Chain Service Interface Definition

Interface	osid.sequencing.Chain
Implements	`osid.OsidObject`
Description	An `Chain` is a chain resource. A chain is inactive if the input is disabled.
Method	isFifo
Description	Tests if elements are appended to the end of the chain.
Return	`boolean`		`true` if elements are appended to the end of the chain, `false` if elements are added to the top of the chain
Compliance	`mandatory`		This method must be implemented.
Method	getChainRecord
Description	Gets the chain record corresponding to the given `Chain` record `Type.` This method is used to retrieve an object implementing the requested record. The `chainRecordType` may be the `Type` returned in `getRecordTypes()` or any of its parents in a `Type` hierarchy where `hasRecordType(chainRecordType)` is `true` .
Parameters	`osid.type.Type`	`chainRecordType`	the type of chain record to retrieve
Return	`osid.sequencing.records.ChainRecord`		the chain record
Errors	NULL_ARGUMENT		`chainRecordType` is `null`
	OPERATION_FAILED		unable to complete request
	UNSUPPORTED		`hasRecordType(chainRecordType)` is `false`
Compliance	`mandatory`		This method must be implemented.