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The key file for any flavor is called metadata.xml.

This defines the set of item and dependency types that may occur in a data file of this flavor.

We distinguish here between three kinds of item types:
·Module types (mandatory)  
·Nested types (optional)  
·Virtual types (implicit)  

All these different types ultimately boil down to some string name. In some cases it is useful to define alternative names that map to the same construct.