Selecting a Root Map
Oxygen XML Author Eclipse plugin allows you to select a root map (a main DITA map) that defines a hierarchical structure of submaps and establishes a key space that defines the keys used in all the other DITA maps and topics in the project. Specifying the correct root map helps to prevent validation problems when you work with keyrefs and also acts as the foundation for content completion. All the keys that are defined in a root map are available in the submaps that are contained within the root map.
There are several ways to select or change the root map:
  - The easiest method is to use the Context drop-down menu on the DITA Maps Manager toolbar to select the appropriate context root map that Oxygen XML Author Eclipse plugin uses to define a hierarchical structure of submaps and to establish a key space that defines the keys that are propagated throughout the entire map structure.
-  You can use the  Choose context root map drop-down on
          the DITA Maps
              Manager toolbar to browse or search for root maps with
          the following choices: Choose context root map drop-down on
          the DITA Maps
              Manager toolbar to browse or search for root maps with
          the following choices: Browse for local file - Opens a local file browser dialog box,
              allowing you to select a local root map. Browse for local file - Opens a local file browser dialog box,
              allowing you to select a local root map.
 Browse workspace -
              Allows you to select a root map from the local workspace. Browse workspace -
              Allows you to select a root map from the local workspace.
 Browse for remote file - Displays the Open using SFTP dialog
                box that allows you to select a remotely stored root map. Browse for remote file - Displays the Open using SFTP dialog
                box that allows you to select a remotely stored root map.
 Browse for archived file - Displays the Archive
                  Browser that allows you to browse the content of an archive and
              choose a root map. Browse for archived file - Displays the Archive
                  Browser that allows you to browse the content of an archive and
              choose a root map.
 Browse Data Source Explorer
              - Opens the Data Source Explorer that allows you to browse the
              data sources defined in the Data Sources
                preferences page.Tip:You can open the Data Sources preferences page by using the Configure Database Sources shortcut from the Open URL dialog box. Browse Data Source Explorer
              - Opens the Data Source Explorer that allows you to browse the
              data sources defined in the Data Sources
                preferences page.Tip:You can open the Data Sources preferences page by using the Configure Database Sources shortcut from the Open URL dialog box.
 Search for file - Displays
              the Find Resource dialog
                box to search for a root map. Search for file - Displays
              the Find Resource dialog
                box to search for a root map.
 Choose context from main files - Allows you to
              choose a context root map from the DITA maps and the DITA-OT project files that are
              set in the Main Files folder. Choose context from main files - Allows you to
              choose a context root map from the DITA maps and the DITA-OT project files that are
              set in the Main Files folder.
 
- If you insert a key reference using the Cross Reference
          action from the  Link drop-down
          menu (from the toolbar or Link submenu of the contextual menu) and
          keys are not gathered from the expected DITA map, you can change the
            root map by using the Change Root Map link in the
            Choose Key dialog box that is opened when you click the Link drop-down
          menu (from the toolbar or Link submenu of the contextual menu) and
          keys are not gathered from the expected DITA map, you can change the
            root map by using the Change Root Map link in the
            Choose Key dialog box that is opened when you click the Choose Key Reference
          button. Choose Key Reference
          button.
- If you insert a content key reference or key reference using the
               Reuse Content action (from
          the toolbar, DITA menu, or Reuse submenu of
          the contextual menu) and keys are not gathered from the expected DITA map,
          you can change the root map by using the Change Root
            Map link in the Choose Key dialog box that is opened
          when you click the Reuse Content action (from
          the toolbar, DITA menu, or Reuse submenu of
          the contextual menu) and keys are not gathered from the expected DITA map,
          you can change the root map by using the Change Root
            Map link in the Choose Key dialog box that is opened
          when you click the Choose Key
            Reference button. Choose Key
            Reference button.
