OSID - osid.grading.GradebookColumn Service Interface Definition

Interface	osid.grading.GradebookColumn
Implements	`osid.OsidObject`
Used By	`osid.grading.GradeEntry`
	`osid.grading.GradebookColumnAdminSession`
	`osid.grading.GradebookColumnList`
	`osid.grading.GradebookColumnLookupSession`
	`osid.grading.GradebookColumnSummary`
	`osid.grading.calculation.GradebookColumnCalculation`
Description	A `GradebookColumn` represents a series of grade entries in a gradebook. Each GradeEntry in a column share the same `GradeSystem`.
Method	getGradeSystemId
Description	Gets the `GradeSystem Id` in which this grade belongs.
Return	`osid.id.Id`		the grade system `Id`
Compliance	`mandatory`		This method must be implemented.
Method	getGradeSystem
Description	Gets the `GradeSystem` in which this grade belongs.
Return	`osid.grading.GradeSystem`		the package grade system
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getGradebookColumnRecord
Description	Gets the gradebook column record corresponding to the given `GradeBookColumn` record `Type`. This method ie used to retrieve an object implementing the requested record. The `gradebookColumnRecordType` may be the `Type` returned in `getRecordTypes()` or any of its parents in a `Type` hierarchy where `hasRecordType(gradebookColumnRecordType)` is `true`.
Parameters	`osid.type.Type`	`gradebookColumnRecordType`	the type of the record to retrieve
Return	`osid.grading.records.GradebookColumnRecord`		the gradebook column record
Errors	NULL_ARGUMENT		`gradebookColumnRecordType` is `null`
	OPERATION_FAILED		unable to complete request
	UNSUPPORTED		`hasRecordType(gradebookColumnRecordType)` is `false`
Compliance	`mandatory`		This method must be implemented.