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In this microlearning, we will educate you on what we mean when we talk about message definitions.

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Should you have any questions, please contact [[academy@emagiz.com>>mailto:academy@emagiz.com]].

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== 1. Prerequisites ==

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* Completion of the [[exercises>>doc:Main.eMagiz Academy.Use Cases.Data modeling in Design.Exercises.WebHome||target="blank"]] from the Data modeling in Design use case.

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== 2. Key concepts ==

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This microlearning contains the solutions to the [[exercises>>doc:Main.eMagiz Academy.Use Cases.Data modeling in Design.Exercises.WebHome||target="blank"]] from the Data modeling in Design use case.

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== 3. CDM, CDM & system message, message mapping ==

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* Creating a CDM

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By importing the Order.xsd file, the CDM should result in the following:

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[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--creating-a-CDM.png]]

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* Creating a CDM message

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The CDM message data model should look like the following:

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[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--creating-a-CDM-message-data-model.png]]

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The CDM message definition should look like the following:

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[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--creating-a-CDM-message-definition.png]]

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* Creating a system message

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By importing the TransportOrder.xsd file, the system message data model should result in the following:

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[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--creating-a-system-message-data-model.png]]

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The system message definition should look like the following:

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[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--creating-a-system-message-definition.png]]

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* Complete message mapping

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The completed message mapping should look like the following:

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[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--complete-message-mapping-first-part.png]]

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[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--complete-message-mapping-second-part.png]]

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== 4. Key takeaways ==

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* The CDM holds all entities and attributes that are relevant within the context of your complete integration landscape.

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* The CDM message is tailor-made for a specific piece of data and only holds the entities and attributes relevant for that piece of data.

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* A system message is specific to a system.

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== 5. Suggested Additional Readings ==

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If you are interested in this topic and want more information on it please read the help text provided by eMagiz.

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