| http://www.w3.org/ns/prov#value | - odiment, the hollow body 14 is substantially entirely constituted by a suitable liquid-permeable material which--preferably--is also substantially noncompressible.For the purposes of the invention, a suitable substantially liquid-permeable material may be selected among porous materials, such as for example terracotta, ceramics, porous plastics materials, such as for example polyethylene, porouspo
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