/usr/include/AppStream/ is in libappstream-dev 0.10.6-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/AppStream/appstream.h
/usr/include/AppStream/as-bundle.h
/usr/include/AppStream/as-category.h
/usr/include/AppStream/as-checksum.h
/usr/include/AppStream/as-component.h
/usr/include/AppStream/as-distro-details.h
/usr/include/AppStream/as-enums.h
/usr/include/AppStream/as-icon.h
/usr/include/AppStream/as-image.h
/usr/include/AppStream/as-metadata.h
/usr/include/AppStream/as-pool.h
/usr/include/AppStream/as-provided.h
/usr/include/AppStream/as-release.h
/usr/include/AppStream/as-screenshot.h
/usr/include/AppStream/as-spdx.h
/usr/include/AppStream/as-suggested.h
/usr/include/AppStream/as-translation.h
/usr/include/AppStream/as-utils.h
/usr/include/AppStream/as-validator-issue.h
/usr/include/AppStream/as-validator.h