True Relational to PseudoRelational? needs triggers for constraints
is not possible to define constraints using Bag Algebra? or is it just not efficient?
True Relational to PseudoRelational? needs support of user defined types in the PseudoRelational? database
how to translate them if there there is no support in the PseudoRelational? database?
True Relational Operation/Constraint to Pseudo Relational PersistentStorageModule?/Trigger
What features are required in PersistentStoredModules so that the a D language (such as TutorialDee) can be compiled in to PersistentStoredModules? (Compilation is necessary so that the underlying PseudoRelationalDatabase? protects its own integrity even if not accessed using the TrueRelationalMapper?. One example would be the very powerful constraints available in TutorialDee, and the fact that there is not even one Sql database that implements CREATE ASSERTION, so the D constraints would have to be compiled into triggers/materialized views with checks)
True Relational to PseudoRelational? needs Relvars
most (all?) PseudoRelational? database have no support for relvars, it is going to be too hard implement them in an efficient way