1. Open the data dictionary by double-clicking in the model navigator.
  2. Drag the 'Structure' element from the model element library onto the data dictionary element in the editor.
  3. Edit the name of the structure element in the properties view and name it 'Point'.
  4. Rename the members of the structure to 'x', and 'y', respectively.
  5. Set the type of both members to 'double'.