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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.

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    Package handling the compilation of queries.
    Provides compilation of "string-based" queries. Provides handling for different query languages
    such as JDOQL, JPQL and SQL(simplified).
    Compilation of a string-based query goes through two steps.
    
        Parse of the string converting each component of the query into a Node tree
        Compilation of the Node tree into an expression tree
    
    From this tree the evaluation process can be configured to convert it into the native query
    language for the datastore; this part is handled within each datastore plugin.
    From this tree an in-memory evaluation can be performed. This is provided in the
    org.datanucleus.query.evaluator package and subpackage(s).