This abstract class is the Field Engine Protocol Extension class. Its purpose is to provide services necessary for fields evaluation implemented at the host application level.
Retrieves the current database of the host application. The purpose of the function is to allow using the current database's properties when processing NDBRO fields.
Returns the OdDbTable entity ID which is supposed to be the owner of the field object. Intended to be used during adding or modifying a formula field in one of table cells, while the field can be a non-database-resident.