Input data: Sample data provided by @clausnagel during the issue
Validation tool: VS Code with XML Extension v0.18.3 by Red Hat, and FZKViewer 6.3 Build 2170
Validation results:
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VS Code with XML Extension: All errors are resolved using modified sample data Building_CityGML3.0_LOD2_with_several_attributes.gml by importing individual .xsd files and avoid uging CityGML.xsd, and describing namespace "core:" explicitly.
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FZKViewer: 204 errors are reported by XML Schema Validation function, and they are not resolved. FZKViewer couldn't save the log file of 204 errors, so only Log Message Building_CityGML3.0_LOD2_with_several_attributes.logxml are saved for reference.