| http://www.w3.org/ns/prov#value | - Although an upper layer (first fibrous layer) less dense than the lower layer (second fibrous layer) can be vaguely discerned, the thickness of the two layers is not for example of an order of magnitude greater than the thickness of the fibres such as to allow it to be clearly determined whether or not there is a progressive increase of density in each of the layers.
|
