| Interface | Description | 
|---|---|
| ExtractManager | 
 A class responsible for extract refactoring. 
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| ExtractReference | 
 Represents logical model relation from the extract source to the extract target. 
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| ExtractSource | 
 Represents the source model end of the extract refactoring. 
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| ExtractTarget | 
 Controls extract refactoring result: target diagram type, target namespace,
 references from extract source to the target. 
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