| http://www.w3.org/ns/prov#value | - However, in embodiments where the device 12 c, 12 d does have a hollow cavity (e.g., a tube 20 as shown in FIGS. 2-2B) within or next to the porous matrix 24, there may be a check valve or other means for closing the tube 38 (e.g., compressing, clamping, clipping, sealing, cutting, doubling over, ligating or otherwise manipulating or sealing the tube as shown in the examples of FIGS. 8A-8E and des
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