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14	14	== 3. CDM, CDM & system message, message mapping ==
15	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 ==
	18	+Please add the following entities and attributes to your CDM:
	19	+
	20	+* Person, with attributes ID, Name, and Email
	21	+* PlatformCourse, with attributes ID and Name
16	16
17		-* Creating a CDM
18		- Please import the file Order.xsd in your CDM.
19		-* Creating a CDM message ==
20		- Now, go to your CDM message and select Order as root entity. Add all other entities and attributes from Order.xsd, which were imported into the CDM, to your CDM message definition.
21	21
	24	+One person has access to many platform courses. It should look like the following:
	25	+
	26	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--adding-attributes-entities-CDM.png]]
	27	+
	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	+
22	22	== 3.3 Creating a system message ==
23		-In one of your System messages, import the file TransportOrder.xsd. Select CreateOrder as root entity and add all other entities and attributes to your system definition.
	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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	39	+
	40	+One user has access to many courses. It should look like the following:
	41	+
	42	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--adding-attributes-entities-system-message.png]]
	43	+
	44	+Now, remove the attribute Name in Course by using the Toggle canvas edit mode. It should result in the following:
	45	+
	46	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--remove-attribute-system-message.png]]
	47	+
25	25	== 3.4 Complete message mapping ==
26	26
27	27	Now that you have completed these steps, go to Message mapping and complete the mapping.
28	28
29		-The solutions to these exercises can be found [[here>>doc:Main.eMagiz Academy.Use Cases.Data modeling in Design.Exercises.Solutions.WebHome||target="blank"]].
	52	+[[image:Main.Images.Usecase.WebHome@data-modeling-in-design-exercises--complete-message-mapping.png]]
	53	+
	54	+== 4. Assignment ==
30	30
31		-== 4. Key takeaways ==
	56	+Navigate to Design and open the message definition option of at least one integration within your project.
	57	+This assignment can be completed within the (Academy) project that you have created/used in the previous assignment.
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33		-* The CDM holds all entities and attributes that are relevant within the context of your complete integration landscape.
34		-* 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.
35		-* A system message is specific to a system.
	59	+== 5. Key takeaways ==
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	61	+* 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
	62	+* Some message definitions are specific to a system. Others are generic across systems
37	37
38		-== 5. Suggested Additional Readings ==
39	39
40		-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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	66	+== 6. Suggested Additional Readings ==
42	42
	68	+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:
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	70	+* [API Gateway model](crashcourse-api-gateway-api-data-model.md)
	71	+* [Understanding the eMagiz CDM](crashcourse-messaging-what-is-cdm.md)
	72	+* [Event Streaming data model](intermediate-configuring-event-streaming-data-model.md)
	73	+
	74	+== 7. Silent demonstration video ==
	75	+
	76	+This video demonstrates a working solution and how you can validate whether you have successfully completed the assignment.
	77	+
	78	+{{video attachment="crashcourse-platform-design-what-is-a-message-definition.mp4" reference="Main.Videos.Microlearning.WebHome"/}}
	79	+
44	44	)))((({{toc/}}))){{/container}}{{/container}}