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The Java Data Objects API (JDO) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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    Package providing expressions for building a typed JDOQL query.
    Fields/Params/Vars of a persistable type are represented as Expression. 
    All generated "Q" classes extend "PersistableExpression", and provide the fields/properties 
    of the persistable class as Expression types.
    Fields/Params/Vars of a container type are represented as CollectionExpression, MapExpression.
    Fields/Params/Vars of other types, or literals are represented by
    
        StringExpression
        EnumExpression
        NumericExpression
        BooleanExpression
        ByteExpression
        CharacterExpression
        DateExpression
        DateTimeExpression
        TimeExpression
        ObjectExpression