A welding structure for a fuel tank including a resin inner shell and a resin outer shell interposed by a fuel permeation prevention layer such that they are laminated, and a resin component attached to the fuel tank. The display presents sonar images. Some or all of the media may be of different density material from each other. In accordance with an aspect of the present invention, application submit an XML assembly manifest which comprises: the assembly identity, the application binaries, its dependencies etc.