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In This paper, we present an approach that takes an existing relational database as input, obtains a copy of its metadata and the principle of semantic enrichment to extract different object principles including aggregation, inheritance, and composition. The first phase of the migration process is the CDM is generating an automatic, in the second phase we move towards the creation of schema object from the relational schemas, and the last step is the mapping of data with Query by Example in db4o.