/usr/include/xqilla/items/impl/ is in libxqilla-dev 2.3.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xqilla/items/impl/ATBooleanOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATDateOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATDateTimeOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATDecimalOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATDoubleOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATDurationOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATFloatOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATGDayOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATGMonthDayOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATGMonthOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATGYearMonthOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATGYearOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATQNameOrDerivedImpl.hpp
/usr/include/xqilla/items/impl/ATTimeOrDerivedImpl.hpp