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Chapter 5. Model Object Extensions
5.1. Model Object Extensions
Teiid Designer in conjunction with JBoss Data Virtualization provides an extensible framework to define custom properties for model objects other than what is defined in the metamodel. These custom property values are added to your VDB and included in your runtime metadata. This additional metadata is available to use in your custom translators for both source query manipulation as well as adjusting your result set data being returned.
Teiid Designer introduces a new Model Extension Definition (MED) framework that will replace the EMF based Model Extension metamodel.
This MED framework provides the following improvements:
- Eliminate need for separate EMF metamodel.
- Simpler approach including reduction of extendable metamodels and metamodel objects (Relational, Web Services, XML Document, User Defined Functions) and replacing EMF terminology with basic object types.
- Allows metamodels to be extended by multiple MEDs.
- MEDs are stored in models so no added dependency needed in VDB.
