| http://www.w3.org/ns/prov#value | - See also 6.4.5. alone.6.7.5 Play Yard Surfaces: The designer should also note the following:Surfaces for play yards, based on their physical properties, can be Organic materials, such as wood chips, bark chips, and pre-engineeredcategorized into three general types: resilient, hard, and grass/turf.
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