This session creates, updates, and deletes CanonicalUnits in bulk. The data for create and update is provided by the consumer via the form object. OsidForms are requested for each create or update and may not be reused.

Create and update operations differ in their usage. To create a CanonicalUnit, a CanonicalUnitForm is requested using getCanonicalUnitFormsForCreate() specifying the desired record Types or none if no record Types are needed. Each of the returned CanonicalUnitForms will indicate that it is to be used with a create operation and can be used to examine metdata or validate data prior to creation. Once a CanonicalUnitForm is submiited to a create operation, it cannot be reused with another create operation unless the first operation was unsuccessful. Each CanonicalUnitForm corresponds to an attempted transaction.

The CanonicalUnitForms returned from getCanonicalUnitFormsForCreate() may be linked to the originating request through the peer Ids of the CanonicalUnitForm. In the case where there may be duplicates, any CanonicalUnitForm of the same peer Ids may be used for a create operation.

Once a batch of CanonicalUnitForms are submitted for create, a CreateResponse is returned for each CanonicalUnitForm, although the ordering is not defined. Only errors that pertain to the entire create operation are returned from createCanonicalUnits(), errors specific to an individual CanonicalUnitForm are indicated in the corresponding CreateResponse. CreateResponses may be linked to the originating CanonicalUnitForm through the CanonicalUnitForm Id .

For updates, CanonicalUnitForms are requested to the CanonicalUnit Id that is to be updated using getCanonicalUnitFormsForUpdate() where the reference Id in the CanonicalUnitForm may be used to link the request. Similarly, the CanonicalUnitForm has metadata about the data that can be updated and it can perform validation before submitting the update. The CanonicalUnitForm can only be used once for a successful update and cannot be reused.

Once a batch of CanonicalUnitForms are submitted for update, an UpdateResponse is returned for each CanonicalUnitForm, although the ordering is not defined. Only errors that pertain to the entire update operation are returned from updateCanonicalUnits(), errors specific to an individual CanonicalUnitForm are indicated in the corresponding UpdateResponse. UpdateResponses may be linked to the originating CanonicalUnitForm through the CanonicalUnitForm Id.

The delete operations delete CanonicalUnits in bulk. To unmap a CanonicalUnit from the current Catalogue, the CanonicalUnitCatalogueAssignmentSession should be used. These delete operations attempt to remove the CanonicalUnit itself thus removing it from all known Catalogue catalogs. Bulk delete operations return the results in DeleteResponses.