The OsidExtensibleForm is used to create and update extensible objects. The form is a container for data to be sent to an update or create method of a session.

The same OsidForm is typically used for both create and update operations. For create operations, an OsidForm is requested for a list of OsidRecord Types. The request is successful if an OsidObject can be created for that combination of the given OsidRecord Types although they may not all be required. getRequiredRecordTypes() shows a list of OsidRecord Types that are required for a successful create operation (typically because there is a required field). This method is for informational purposes and may be the list of OsidRecord Types supplied to the acquisition of the OsidForm, a subset of those types, or a variant because of Type equivalency.

Following a create operation, the OsidRecord Types are assumed to be fixed. Update operations can examine getRecordTypes() to see which OsidRecords exist for that OsidObject. getRequiredRecordTypes() will typically be empty unless there is some field in an OsidRecord required for the update operation to succeed.