Features

2. Guarantee of minimal mapping.

3. Duality of query and data translation.

• abstraction of information objects as conjunctive queries.

4. Unified approach for both flat and hierarchical data.

• extending attribute-value to path-value pairs.

[lname “Smith”]

[fname “John”]

[owner “Smith, J.”]

R.2

[lname “Smith”]

[owner “Smith”]

R.3

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