/usr/include/xqilla/update/ is in libxqilla-dev 2.3.3-2+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xqilla/update/FunctionPut.hpp
/usr/include/xqilla/update/PendingUpdateList.hpp
/usr/include/xqilla/update/UApplyUpdates.hpp
/usr/include/xqilla/update/UDelete.hpp
/usr/include/xqilla/update/UInsertAfter.hpp
/usr/include/xqilla/update/UInsertAsFirst.hpp
/usr/include/xqilla/update/UInsertAsLast.hpp
/usr/include/xqilla/update/UInsertBefore.hpp
/usr/include/xqilla/update/UInsertInto.hpp
/usr/include/xqilla/update/URename.hpp
/usr/include/xqilla/update/UReplace.hpp
/usr/include/xqilla/update/UReplaceValueOf.hpp
/usr/include/xqilla/update/UTransform.hpp