How to use this ADE in my own CityGML file？

[keleisi2001]

If I want to use it in my own CityGML file, how to import it? Has the special link format import it?

The original import format:
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xAL="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0"
xmlns:app="http://www.opengis.net/citygml/appearance/2.0"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:gml="http://www.opengis.net/gml"
xmlns="http://www.opengis.net/citygml/2.0"
xmlns:bldg="http://www.opengis.net/citygml/building/2.0"
xsi:schemaLocation="http://www.opengis.net/citygml/2.0 http://schemas.opengis.net/citygml/2.0/cityGMLBase.xsd
http://www.opengis.net/citygml/appearance/2.0 http://schemas.opengis.net/citygml/appearance/2.0/appearance.xsd
http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd">