Additional MetadataadditionalMetadata |___element 'metadata' |___element 'unitList' |___element 'unit' | \___attribute 'id' = 'gramsPerCubicMeter' | \___attribute 'name' = 'gramsPerCubicMeter' | \___attribute 'unitType' = 'massDensity' | \___attribute 'parentSI' = 'kilogramsPerCubicMeter' | \___attribute 'multiplierToSI' = '0.001' | \___attribute 'abbreviation' = 'g/m³' |___text 'grams per cubic meter' |