An AIP Data Set may include extension of the core model, on condition that: | Tip |
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| The extension does not duplicate or replace features/properties that exist in the core AIXM model. |
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| The Data Set shall remain valid against one of the AIXM BasicMessage schema mentioned. |
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| The extension schema shall be made available through a public URL. |
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| A document explaining the purpose of the extension and the usage of each extension element shall be made available to all recipients of the data set. |
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| The UML representation of the extension should be made available to all the recipients of the data set. |
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