/usr/include/Swiften/Queries/ is in libswiften-dev 2.0+dev6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Swiften/Queries/DummyIQChannel.h
/usr/include/Swiften/Queries/GenericRequest.h
/usr/include/Swiften/Queries/GetResponder.h
/usr/include/Swiften/Queries/IQChannel.h
/usr/include/Swiften/Queries/IQHandler.h
/usr/include/Swiften/Queries/IQRouter.h
/usr/include/Swiften/Queries/RawRequest.h
/usr/include/Swiften/Queries/Request.h
/usr/include/Swiften/Queries/Requests/
/usr/include/Swiften/Queries/Requests/GetInBandRegistrationFormRequest.h
/usr/include/Swiften/Queries/Requests/GetPrivateStorageRequest.h
/usr/include/Swiften/Queries/Requests/GetSecurityLabelsCatalogRequest.h
/usr/include/Swiften/Queries/Requests/GetSoftwareVersionRequest.h
/usr/include/Swiften/Queries/Requests/SetPrivateStorageRequest.h
/usr/include/Swiften/Queries/Requests/SubmitInBandRegistrationFormRequest.h
/usr/include/Swiften/Queries/Responder.h
/usr/include/Swiften/Queries/Responders/
/usr/include/Swiften/Queries/Responders/SoftwareVersionResponder.h
/usr/include/Swiften/Queries/SetResponder.h