# Define additional strings for LandXML string roads

1. In the map, tap the LandXML string road to select it and then tap Edit. Alternatively, tap and select Define / LandXML road, select the road to edit and then tap Next.

   If the road you want to edit is not shown in the map, tap in the map toolbar to open the Layer manager and select the Map files tab. Select the file and then make the appropriate layer(s) visible and selectable. The file must be in the current project folder.

2. Tap Additional strings (Derived).
3. To add a new string:
   1. Tap Add.
   2. Enter the String name and select the String type.
      - Dependent: The string forms part of the road surface.
      - Independent: The string does not form part of the road surface. Independent strings are ideal for underground services, for example a fiber‑optic cable.

      Both string types are defined parallel to the existing string for the length of that string.

   3. Tap Accept.
4. To define or edit the string, tap Edit.
   1. The Horizontal and vertical geometry item is selected. Tap Edit.
   2. Tap Add.
   3. In the Derive from field, tap to select the string that the additional string will be derived from. Tap the string in the map or tap String and select the string from the list. Tap Accept.
   4. Select the String derivation method and enter the values that define the string.
   5. Tap Store.
5. Tap Accept three times to return to the Edit road screen.
6. Tap Store.

Once you have defined an additional string, you can edit it, review it or stake it out.