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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		-* Creating a system message
22		- 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.
23	23
24		-== 3.4 Complete message mapping ==
	24	+One person has access to many platform courses. It should look like the following:
25	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	+
	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
	38	+
	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	+
	48	+== Complete message mapping ==
	49	+
26	26	Now that you have completed these steps, go to Message mapping and complete the mapping.
27	27
28		-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 ==
29	29
30		-== 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.
31	31
32		-* The CDM holds all entities and attributes that are relevant within the context of your complete integration landscape.
33		-* 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.
34		-* A system message is specific to a system.
	59	+== 5. Key takeaways ==
35	35
	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
36	36
37		-== 5. Suggested Additional Readings ==
38	38
39		-If you are interested in this topic and want more information on it please read the help text provided by eMagiz.
40	40
	66	+== 6. Suggested Additional Readings ==
41	41
	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	+
43	43	)))((({{toc/}}))){{/container}}{{/container}}