Metadata

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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.