| http://www.w3.org/ns/prov#value | - The embodiment 3 of the invention will now be described with reference to FIGS. 12A to 12C. In the drawings, FIG. 12A is a plan view, FIG. 12B is a cross sectional view taken along the line A--A' in FIG. 12A, and FIG. 12C is a cross sectional view taken along the line B--B' in FIG. 12A.
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