On Nov 6, 2010, at 11:02 PM, Farrukh Ijaz wrote: >> For your case, I'm finding it difficult to imagine why two entities >> (IS-A) have such different relationship requirements. > > The model has a legacy. In the beginning the entities appear to be different > but semantically they are have some common behaviour when observed under > specific domain . E.g. in a File System we have File and Folder (Directory) > two separate entities. But at OS level, both have name, timestamp, > permissions etc. The need before was to treat File and Folder as separate > entities, but now the requirement demands to have some granularity among > them. This is just an example to explain the situation.
But do they share behavior? Shared data is not necessarily an indication for inheritance. Chuck -- Chuck Hill Senior Consultant / VP Development Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems. http://www.global-village.net/products/practical_webobjects
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