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The namespace is a prefix in the node type name. It enables you to create node types without fearing any conflict with existing node types.
In Repository, select Namespaces to open the Namespaces panel.
Click Namespaces form open the Register New Namespace form.
at the bottom of theEnter the value for the Namespace Prefix field that is required.
Enter the value for the URI field which must be unique and required.
The namespace must not contain special characters, such as !,#,$,&,*,(,).