/usr/include/AppStream/as-release.h is in libappstream-dev 0.7.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | /* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2014 Richard Hughes <richard@hughsie.com>
 * Copyright (C) 2014 Matthias Klumpp <matthias@tenstral.net>
 *
 * Licensed under the GNU Lesser General Public License Version 2.1
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2.1 of the license, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
#if !defined (__APPSTREAM_H) && !defined (AS_COMPILATION)
#error "Only <appstream.h> can be included directly."
#endif
#ifndef __AS_RELEASE_H
#define __AS_RELEASE_H
#include <glib-object.h>
#define AS_TYPE_RELEASE			(as_release_get_type())
#define AS_RELEASE(obj)			(G_TYPE_CHECK_INSTANCE_CAST((obj), AS_TYPE_RELEASE, AsRelease))
#define AS_RELEASE_CLASS(cls)		(G_TYPE_CHECK_CLASS_CAST((cls), AS_TYPE_RELEASE, AsReleaseClass))
#define AS_IS_RELEASE(obj)		(G_TYPE_CHECK_INSTANCE_TYPE((obj), AS_TYPE_RELEASE))
#define AS_IS_RELEASE_CLASS(cls)	(G_TYPE_CHECK_CLASS_TYPE((cls), AS_TYPE_RELEASE))
#define AS_RELEASE_GET_CLASS(obj)	(G_TYPE_INSTANCE_GET_CLASS((obj), AS_TYPE_RELEASE, AsReleaseClass))
G_BEGIN_DECLS
typedef struct _AsRelease	AsRelease;
typedef struct _AsReleaseClass	AsReleaseClass;
struct _AsRelease
{
	GObject			parent;
};
struct _AsReleaseClass
{
	GObjectClass		parent_class;
	/*< private >*/
	void (*_as_reserved1)	(void);
	void (*_as_reserved2)	(void);
	void (*_as_reserved3)	(void);
	void (*_as_reserved4)	(void);
	void (*_as_reserved5)	(void);
	void (*_as_reserved6)	(void);
	void (*_as_reserved7)	(void);
	void (*_as_reserved8)	(void);
};
GType		 as_release_get_type		(void);
AsRelease	*as_release_new			(void);
/* getters */
const gchar	*as_release_get_version		(AsRelease	*release);
guint64		 as_release_get_timestamp	(AsRelease	*release);
const gchar	*as_release_get_description	(AsRelease	*release);
/* setters */
void		 as_release_set_version (AsRelease	*release,
								const gchar *version);
void		 as_release_set_timestamp	(AsRelease	*release,
						 guint64	 timestamp);
void		 as_release_set_description	(AsRelease	*release,
						 const gchar	*description);
G_END_DECLS
#endif /* __AS_RELEASE_H */
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