Hierarchical Linking in DITA Maps
To create hierarchical linking between the topics in a DITA map, you set the appropriate
            value of the collection-type attribute on the map. See the DITA documentation for the meaning of each of the values of the
            collection-type attribute.
         
Note
Publishing scripts determine when and how to create hierarchical links. The
               
         collection-type attribute does not force a particular style of linking.
               Instead, it declares what the nature of the relationship is between the topics. The
               publishing
               scripts use that information to determine how to link topics. Scripts for different
               types of
               media might make the determination depending on what is appropriate for the particular
               type of
               media. You can provide additional instructions to the scripts using the
               linking attribute.
            To add the collection-type to an item in a map:
         
- Right-click the topic and choose  Edit Properties. The
               Edit Properties dialog box is displayed. Edit Properties. The
               Edit Properties dialog box is displayed.
- In the Attributes tab, select the appropriate value from the Collection type drop-down list.
- You can use the Other attributes table to add a value to the
               linkingattribute.
