<xs:complexType name="IfcMaterialLayer">
<xs:complexContent>
<xs:extension base="ex:Entity">
<xs:sequence>
<xs:element name="Material" nillable="true" minOccurs="0">
<xs:complexType>
<xs:choice>
<xs:element ref="ifc:IfcMaterial" />
</xs:choice>
</xs:complexType>
</xs:element>
<xs:element name="LayerThickness" type="ifc:IfcPositiveLengthMeasure" />
<xs:element name="IsVentilated" type="ifc:IfcBoolean" nillable="true" minOccurs="0" />
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
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