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Apache MetaModel is a library that encapsulates the differences and enhances the capabilities of different datastores. Rich querying abilities are offered to datastores that do not otherwise support advanced querying and a unified view of the datastore structure is offered through a single model of the schemas, tables, columns and relationships.  

Key concepts:

• DataContext
• Query object, the QueryBuilder API and Query parsing
• UpdateableDataContext
• UpdateScript (and BatchUpdateScript)

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