| http://www.w3.org/ns/prov#value | - Preferred forms of the invention are described below with reference to the accompanying drawings in which: FIGURE 1 is an elevation of a rivet according to the invention, FIGURE 2 is a plan view of the rivet of FIGURE 1, FIGURE 3 is a section on the line IIIIII of FIG- URE 1, FIGURE 4 is an elevation, in section, of a panel held to an apertured support structure by the rivet of FIG- URES 1 and 2,
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