gross area
type: ObjectProperty
sub property of: area
label: area lorda @it
label: surface brut @fr
label: área bruta @es

net area
type: ObjectProperty
sub property of: area
label: area netta @it
label: surface net @fr
label: área neta @es

orientation
type: ObjectProperty
sub property of: angle
comment: The orientation is determined as the azimuth angle of a surface relative to true north.
label: orientación @es
label: orientamento @it

Masse volumique
type: ObjectProperty
domain: VolumeElement
label: Volumic Mass

PlaneElement
type: Class
subclass of: Restriction
  on property: orientation
  some values from: QuantityValue
subclass of: Restriction
  on property: area
  some values from: QuantityValue
subclass of: Restriction
  on property: height
  some values from: QuantityValue
subclass of: Restriction
  on property: width
  some values from: QuantityValue
comment: An element that is characterized by its surface. For instance windows or space boundaries.

VolumeElement
type: Class
subclass of: Restriction
  on property: orientation
  some values from: QuantityValue
subclass of: Restriction
  on property: volume
  some values from: QuantityValue
comment: An element that is characterized by a volume (i.e. for which the thickness is important.