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Let us express the query Q: ``find images with 2 people next to each other without any building, or images with buildings without people, or images with animals'' in VisualMOQL. This query is in fact a combination of three queries:

• Q_a: images with 2 people next to each other without any building
• Q_b: images with buildings without people
• Q_c: images with animals

The final expression of the query is given in Figure . Q_a is expressed in MOQL by (Query1 AND NOT Query2) where Query1 is a sub-query expressing images with two people one to the west of the other (see the working canvas of Figure ) and Query2 expresses images with buildings. Q_b is expressed in MOQL by (Query3 AND NOT Query4) where Query3 expresses images with buildings and Query4 expresses images with people. Q_c is expressed by the sub-query Query5 and expresses images with animals. The final expression is obtained by combining the sub-queries using the OR connective.

The VisualMOQL expression is translated into MOQL (Figure ) before being submitted to the query processor. Part of the query result can be seen in Figure .

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Demo

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Vincent Oria
1998-11-24