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2. Using External References in CityGML 2.0 and CityGML 2.0 EnergyADE
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In general, CityGML 2.0 offers a mechanism to access internal and external data like attributes in a dataset via ```xlink```s. These references are normally used to reference to another section in the same CityGML file or dataset but an ```xlink``` can also reference to an external data source.
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Usually ```xlink```s are known to compose a surface from a set of (referenced) subsurfaces as in the following example:
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In general, CityGML 2.0 offers a mechanism to access internal and external data like attributes in a dataset via ```xlink```'s. These references are normally used to reference to another section in the same CityGML file or dataset but an ```xlink``` can also reference to an external data source.
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Usually ```xlink```s are known to compose a surface from a set of (referenced) subsurfaces as in the following sample excerpt from a CityGML Building file:
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```xml
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...
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<bldg:lod2Solid>
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</bldg:lod2Solid>
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...
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```
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The same mechanism can be used with the EnergyADE as shown in the following example where the material properties of a construction reference to a material definition in some other part of the same CityGML file:
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```xml
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...
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<gml:featureMember>
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<energy:Construction gml:id="GML_1d95ee10-2b3e-424c-afce-6bc4ad6017d2">
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<gml:description>Bau 05 Structure Facade (U-Value 1.105)</gml:description>
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<gml:name>Bau05-Facade-SingleLayer</gml:name>
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<energy:uValue uom="W/K*m2">1.105</energy:uValue>
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<energy:layer>
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<energy:Layer gml:id="GML_373c66c6-0b0d-4d76-9481-d61e65653e02">
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<energy:layerComponent>
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<energy:LayerComponent gml:id="GML_e5e4790b-1b4c-47de-88ae-fdac359a7906">
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<energy:areaFraction uom="scale">1</energy:areaFraction>
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<energy:thickness uom="m">0.40</energy:thickness>
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<energy:material xlink:href="#GML_94749b5f-ee27-491b-a906-eea7da12e9a0"/>
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</energy:LayerComponent>
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</energy:layerComponent>
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</energy:Layer>
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</energy:layer>
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</energy:Construction>
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</gml:featureMember>
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...
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<gml:featureMember>
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<energy:SolidMaterial gml:id="GML_94749b5f-ee27-491b-a906-eea7da12e9a0">
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<gml:description>Material Concrete Facade (2400/0.24/1)</gml:description>
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<gml:name>Material-Concrete-Facade</gml:name>
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<energy:conductivity uom="W/K*m">0.24</energy:conductivity>
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<energy:density uom="kg/m3">2400</energy:density>
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<energy:specificHeat uom="kJ/K*kg">1</energy:specificHeat>
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</energy:SolidMaterial>
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</gml:featureMember>
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...
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```
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