Missing core:creationDate from CityGML Buildings in citydb

[Krassnig]

Hello,

In the CityGML files of the Vienna dataset they store the date they scanned the building in the <core:creationDate> element.

	<core:cityObjectMember>
		<bldg:Building gml:id="UUID_LOD2_043491-77417aa2-b1be-4a0f-a605">
			<gml:name>043491</gml:name>
			<core:creationDate>2016-09-29</core:creationDate> <!-- can't find this one -->
			<gen:stringAttribute name="Blattnummer">
				<gen:value>078085</gen:value>
			</gen:stringAttribute>
			<gen:stringAttribute name="HoeheDach">
				<gen:value>210</gen:value>
			</gen:stringAttribute>
			<gen:stringAttribute name="HoeheGrund">
				<gen:value>206</gen:value>
			</gen:stringAttribute>
                        ....

Once I import this dataset into the 3dcitydb I can't find the creationDate.
I would assume this corresponds to the citydb.cityobject.creation_date but this is set to the date of the import.

Could you please help me get the date in <core:creationDate>?

The CityGML file can be downloaded here: https://www.wien.gv.at/ma41datenviewer/downloads/geodaten/lod2_gml/078085_lod2_gml.zip