* [[Dynamic_Live_Mode|Dynamic Live Mode (DLM)]] - All MetaClasses are always in Live Mode now. If you change a MetaClass, {{UBIK}} adapts the database automatically.
* Relational Polymorphism - Override MetaProperty assignments for MetaClasses and MetaProxyProperty assignments for MetaProxies.
== Enhancements ==
Revision B:
* Better saving performance: The saving performance was improved, especially for individual instances via the network.
* Better bulk saving performance: The saving performance was improved, especially for many instances via the network.
== Enhancements ==
Revision C:
* A base implementation for the ISystemDefinitionProvider interface was created, to make system definition version management easier for plugin developers.
== Bug Fixes ==
Revision C:
* An issue where document related system definitions were incomplete was fixed.
== Bug Fixes ==
Revision C:
* An issue where drag & drop in the relation editor didn't work was fixed.
* [[HowTo:Transfer_Data_from_3.7_to_4.0|Data Transfer from 3.7 Environments]]
* You can now use the Inheritance Graph to override inherited MetaProperties for MetaClasses, or the Meta Proxy Graph to override inherited MetaProxyProperties for MetaProxies. This way, you can specify a different External Key for a MetaProxyProperty in the context of a specialized MetaProxy, for example.