A touch panel includes a plurality of first electrodes, a plurality of second electrodes, and a plurality of wirings. A File System Query instruction permits a richer set of queries to be expressed by a policy engine, thereby permitting more complex policies to be implemented with ease. The lattice matching structure can include a first buffer region, a second buffer region and a superlattice structure formed from AlxGa1-xNAlyGa1-yN layer pairs. A determination is then made of whether the path passes through any of the wavelength layers. The guide tube further includes a side port, intermediate the distal and proximal ends which communicates with the lumen.