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  <IfcVersion version="IFC4X4" />
  <Name>Pset_MaterialOptical</Name>
  <Definition>A set of optical properties of materials.</Definition>
  <Applicability />
  <ApplicableClasses>
    <ClassName>IfcMaterial</ClassName>
  </ApplicableClasses>
  <ApplicableTypeValue>IfcMaterial</ApplicableTypeValue>
  <PropertyDefs>
    <PropertyDef ifdguid="954aff00d1ed11e1800000215ad4efdf">
      <Name>VisibleTransmittance</Name>
      <Definition>Transmittance at normal incidence (visible). Defines the fraction of the visible spectrum of solar radiation that passes through per unit area, perpendicular to the surface.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Visible Transmittance</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="9c720d00d1ed11e1800000215ad4efdf">
      <Name>SolarTransmittance</Name>
      <Definition>The ratio of incident solar radiation that directly passes through a system (also named τe). Note the following equation Asol + Rsol + Tsol = 1</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Solar Transmittance</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="a1cf5780d1ed11e1800000215ad4efdf">
      <Name>ThermalIrTransmittance</Name>
      <Definition>Thermal IR transmittance at normal incidence. Defines the fraction of thermal energy that passes through per unit area, perpendicular to the surface.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Thermal Ir Transmittance</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="a72ca200d1ed11e1800000215ad4efdf">
      <Name>ThermalIrEmissivityBack</Name>
      <Definition>Thermal IR emissivity: back side. Defines the fraction of thermal energy emitted per unit area to "blackbody" at the same temperature, through the "back" side of the material.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Thermal Ir Emissivity Back</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="ac89ec80d1ed11e1800000215ad4efdf">
      <Name>ThermalIrEmissivityFront</Name>
      <Definition>Thermal IR emissivity: front side. Defines the fraction of thermal energy emitted per unit area to "blackbody" at the same temperature, through the "front" side of the material.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Thermal Ir Emissivity Front</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="b7448180d1ed11e1800000215ad4efdf">
      <Name>VisibleReflectanceBack</Name>
      <Definition>Reflectance at normal incidence (visible): back side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the "back" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Visible Reflectance Back</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="bd3a6280d1ed11e1800000215ad4efdf">
      <Name>VisibleReflectanceFront</Name>
      <Definition>Reflectance at normal incidence (visible): front side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the "front" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Visible Reflectance Front</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="c3304380d1ed11e1800000215ad4efdf">
      <Name>SolarReflectanceBack</Name>
      <Definition>Reflectance at normal incidence (solar): back side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the "back" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Solar Reflectance Back</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="c7f4f780d1ed11e1800000215ad4efdf">
      <Name>SolarReflectanceFront</Name>
      <Definition>Reflectance at normal incidence (solar): front side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the "front" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcNormalisedRatioMeasure" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Solar Reflectance Front</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
  </PropertyDefs>
  <PsetDefinitionAliases>
    <PsetDefinitionAlias lang="en" />
  </PsetDefinitionAliases>
</PropertySetDef>