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Following screenshot displays the structure of Retain XML:

Structure of Retain XML

Following are is the description of the tags of retain XML:

<Retain operation="retain">

This is the root tag . It also that specifies the operation. You do not have No need to change anything within this tag. This tag has comment as a property name. <service table="au_users" />
<service table="au_groups" />
<service table="au_filesource" >
<field fieldName="au_filepath" />
</service>

Define comment

This property contains the description of the operation you are performing.

<service>

This is the tag to be defined under <retain> tag. You need to define the type of activities (Servicesservices) of the target environment that you want to retain during deployment to objectsof objects. This tag has the following properties: retainNewActivities, table, and field. 

retainNewActivites

This property contains the Boolean value - true or false. If the value of this property is true, new activities from the source environment will not be migrated to the target environment. If you don't specify this property then it will be treated as true.

Here:

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