... | ... | @@ -23,7 +23,7 @@ Description of that service at [Building Physics Library Web Service](../Buildin |
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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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```xml
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...
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<bldg:lod2Solid>
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<gml:Solid>
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... | ... | @@ -32,12 +32,6 @@ Description of that service at [Building Physics Library Web Service](../Buildin |
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<gml:surfaceMember xlink:href="#GML_7312314b-372f-4161-a9ba-9afceeed0c45"/>
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<gml:surfaceMember xlink:href="#GML_4cf1aa91-09bc-4367-8f44-d017ca5a7617"/>
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<gml:surfaceMember xlink:href="#GML_1531216f-7082-43d7-8d9d-fac11261415a"/>
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<gml:surfaceMember xlink:href="#GML_cd490832-9c42-4346-9761-4d7ff55bc7eb"/>
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<gml:surfaceMember xlink:href="#GML_67cb283f-6258-482a-a14f-40202dffd20d"/>
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<gml:surfaceMember xlink:href="#GML_bce0ea4f-d8cb-4359-bc3b-6ff1fec80292"/>
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<gml:surfaceMember xlink:href="#GML_30015ec3-acf1-4a5b-808e-8d123a0fbe61"/>
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<gml:surfaceMember xlink:href="#GML_f31d1f03-fd11-4ef1-9780-4524790bbd41"/>
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<gml:surfaceMember xlink:href="#GML_0e66a2a0-66fc-4766-a34d-b9b471bc5c53"/>
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<gml:surfaceMember xlink:href="#GML_c69d836d-d138-4b96-b309-0cf893ab9090"/>
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<gml:surfaceMember xlink:href="#GML_f6425cf2-75d9-4b59-903d-2092c0d2d084"/>
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<gml:surfaceMember xlink:href="#GML_90991341-677e-445c-8f81-e2d6269f4aba"/>
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</gml:Solid>
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</bldg:lod2Solid>
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...
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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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