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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality. Also includes the JDO API.

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        Provides classes representing the MetaData for files, packages, classes, fields, containers, etc. 
        Structured to map to the JDO2 Meta-Data file structure, though also now maps to the JPA Meta-Data structure
        approximately.
    
    
        Key aspects of this package are
    
    
    MetaDataManager is the entry point into this package. A call is typically made to getMetaDataForClass 
        and the MetaDataManager will take care of finding the MetaData, parsing any files, and populating the MetaData.
    MetaDataMerger is responsible for merging annotations with metadata, and JDO MetaData with ORM MetaData
    FileMetaData is the top level of a metadata representation, represening the actual file. It will contain 
        metadata for a series of packages, etc. The components are laid out in a tree
    ClassMetaData is the most used class, and is the representation of the persistence of a class. 
        It contains a series of FieldMetaData/PropertyMetaDataobjects, representing the fields and properties
        of the class.
    
    
        The "data" classes have a lifecycle, being created, then populated, and finally initialised. When a file is read in
        all classes are read and populated at that time.