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12	12	This microlearning centers around understanding the concept data modeling in design.
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14		-== 3. Please complete the following steps ==
15		-
16		-
17		-=== 3.1 Creating entities and attributes in your CDM ===
18		-
	14	+== 3. CDM, CDM & system message, message mapping ==
	15	+By following the steps below, you should gain a better understanding of the differences between CDM, CDM messages, and system messages.
	16	+
	17	+== 3.1 Creating a CDM ==
19	19	Please add the following entities and attributes to your CDM:
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21	21	* Person, with attributes ID, Name, and Email
22	22	* PlatformCourse, with attributes ID and Name
23		-
	22	+
	23	+
24	24	One person has access to many platform courses. It should look like the following:
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	26	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--adding-attributes-entities-CDM.png]]
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	28	+== 3.2 Creating a CDM message ==
	29	+Now, go to your CDM message and add the Person and PlatformCourse to your message definition, including all attributes. It should look like the following:
	30	+
	31	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--adding-message-definition-CDM-message.png]]
	32	+
	33	+== 3.3 Creating a system message ==
	34	+In System message, create the following entities and attributes:
	35	+
	36	+* User, with attributes ID and Name
	37	+* Course, with attributes ID and Name
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28	28
29		-== 4. Assignment ==
	40	+One user has access to many courses. It should look like the following:
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31		-Navigate to Design and open the message definition option of at least one integration within your project.
32		-This assignment can be completed within the (Academy) project that you have created/used in the previous assignment.
	42	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--adding-attributes-entities-system-message.png]]
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34		-== 5. Key takeaways ==
	44	+Now, remove the attribute Name in Course by using the Toggle canvas edit mode. It should result in the following:
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36		-* A message definition is a visual representation of how the elements are related to each other, whether they are mandatory and the data types they have that can be used in the message mapping
37		-* Some message definitions are specific to a system. Others are generic across systems
	46	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--remove-attribute-system-message.png]]
	47	+
	48	+== 3.4 Complete message mapping ==
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	50	+Now that you have completed these steps, go to Message mapping and complete the mapping.
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	52	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--complete-message-mapping.png]]
	53	+
40	40
41		-== 6. Suggested Additional Readings ==
	55	+== 4. Key takeaways ==
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43		-If you are interested in this topic and want more information on it please read the help text provided by eMagiz. Furthermore check out these links if you want a more in-depth knowledge of the eMagiz data models:
	57	+* The CDM holds all entities and attributes that are relevant within the context of your complete integration landscape.
	58	+* 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.
	59	+* A system message is specific to a system.
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45		-* [API Gateway model](crashcourse-api-gateway-api-data-model.md)
46		-* [Understanding the eMagiz CDM](crashcourse-messaging-what-is-cdm.md)
47		-* [Event Streaming data model](intermediate-configuring-event-streaming-data-model.md)
48	48
49		-== 7. Silent demonstration video ==
	62	+== 5. Suggested Additional Readings ==
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51		-This video demonstrates a working solution and how you can validate whether you have successfully completed the assignment.
	64	+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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53		-{{video attachment="crashcourse-platform-design-what-is-a-message-definition.mp4" reference="Main.Videos.Microlearning.WebHome"/}}
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	67	+
55	55	)))((({{toc/}}))){{/container}}{{/container}}