...
primvars:Volume Ri:Bound float[6] [0 0 0 0 0 0] Description
primvars:Volume Ri:dimensions integer[3] [required] Description [Volume]
primvars:Volume Ri:type string [required] Description [Volume]
primvars:Volume volume:aggregate string [] Description [Volume]
primvars:Volume volume:dsominmax integer [0] Description [Volume]