code: public static Force imports(Xml root)
      {
          Check.notNull(root);
  
          final Xml node = root.getChild(NODE_FORCE);
  
          final Force force = new Force(node.readDouble(ATT_VX), node.readDouble(ATT_VY));
          force.setVelocity(node.readDouble(0.0, ATT_VELOCITY));
          force.setSensibility(node.readDouble(0.0, ATT_SENSIBILITY));
  
          return force;
      }
docs: Create the force data from node.
  
  @param root The root reference (must not be <code>null</code>).
  @return The force data.
  @throws LionEngineException If unable to read node.