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diff --git a/slv2/ui.h b/slv2/ui.h
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+/* SLV2
+ * Copyright (C) 2007-2011 David Robillard <http://drobilla.net>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 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 General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef SLV2_SLV2_UI_H__
+#define SLV2_SLV2_UI_H__
+
+#include "slv2/slv2.h"
+#include "lv2/lv2plug.in/ns/extensions/ui/ui.h"
+
+/** @addtogroup slv2
+ * @{
+ */
+
+typedef struct _SLV2UI* SLV2UI;   /**< Plugin UI. */
+typedef void*           SLV2UIs;  /**< set<UI>. */
+
+SLV2_COLLECTION(SLV2UIs, SLV2UI, slv2_uis)
+
+/** Get a UI from @a uis by URI.
+ * Return value is shared (stored in @a uis) and must not be freed or
+ * modified by the caller in any way.
+ * @return NULL if no UI with @a uri is found in @a list.
+ */
+SLV2_API
+SLV2UI
+slv2_uis_get_by_uri(SLV2UIs   uis,
+                    SLV2Value uri);
+
+/** Get a list of all UIs available for this plugin.
+ * Note this returns the URI of the UI, and not the path/URI to its shared
+ * library, use slv2_ui_get_library_uri with the values returned
+ * here for that.
+ *
+ * Returned value must be freed by caller using slv2_uis_free.
+ */
+SLV2_API
+SLV2UIs
+slv2_plugin_get_uis(SLV2Plugin plugin);
+
+/** @name Plugin UI
+ * @{
+ */
+
+/** Get the URI of a Plugin UI.
+ * @param ui The Plugin UI
+ * @return a shared value which must not be modified or freed.
+ */
+SLV2_API
+SLV2Value
+slv2_ui_get_uri(SLV2UI ui);
+
+/** Get the types (URIs of RDF classes) of a Plugin UI.
+ * @param ui The Plugin UI
+ * @return a shared value which must not be modified or freed.
+ */
+SLV2_API
+SLV2Values
+slv2_ui_get_classes(SLV2UI ui);
+
+/** Check whether a plugin UI is a given type.
+ * @param ui        The Plugin UI
+ * @param class_uri The URI of the LV2 UI type to check this UI against
+ */
+SLV2_API
+bool
+slv2_ui_is_a(SLV2UI ui, SLV2Value class_uri);
+
+/** Get the URI for a Plugin UI's bundle.
+ * @param ui The Plugin UI
+ * @return a shared value which must not be modified or freed.
+ */
+SLV2_API
+SLV2Value
+slv2_ui_get_bundle_uri(SLV2UI ui);
+
+/** Get the URI for a Plugin UI's shared library.
+ * @param ui The Plugin UI
+ * @return a shared value which must not be modified or freed.
+ */
+SLV2_API
+SLV2Value
+slv2_ui_get_binary_uri(SLV2UI ui);
+
+/** @} */
+/** @name Plugin UI Instance
+ * @{
+ */
+
+typedef struct _SLV2UIInstance* SLV2UIInstance;
+
+/** Instantiate a plugin UI.
+ * The returned object represents shared library objects loaded into memory,
+ * it must be cleaned up with slv2_ui_instance_free when no longer
+ * needed.
+ *
+ * @a plugin is not modified or directly referenced by the returned object
+ * (instances store only a copy of the plugin's URI).
+ *
+ * @a host_features NULL-terminated array of features the host supports.
+ * NULL may be passed if the host supports no additional features (unlike
+ * the LV2 specification - SLV2 takes care of it).
+ *
+ * @return NULL if instantiation failed.
+ */
+SLV2_API
+SLV2UIInstance
+slv2_ui_instantiate(SLV2Plugin                plugin,
+                    SLV2UI                    ui,
+                    LV2UI_Write_Function      write_function,
+                    LV2UI_Controller          controller,
+                    const LV2_Feature* const* features);
+
+/** Free a plugin UI instance.
+ * @a instance is invalid after this call.
+ * It is the caller's responsibility to ensure all references to the UI
+ * instance (including any returned widgets) are cut before calling
+ * this function.
+ */
+SLV2_API
+void
+slv2_ui_instance_free(SLV2UIInstance instance);
+
+/** Get the widget for the UI instance.
+ */
+SLV2_API
+LV2UI_Widget
+slv2_ui_instance_get_widget(SLV2UIInstance instance);
+
+/** Get the LV2UI_Descriptor of the plugin UI instance.
+ * Normally hosts should not need to access the LV2UI_Descriptor directly,
+ * use the slv2_ui_instance_* functions.
+ *
+ * The returned descriptor is shared and must not be deleted.
+ */
+SLV2_API
+const LV2UI_Descriptor*
+slv2_ui_instance_get_descriptor(SLV2UIInstance instance);
+
+/** Get the LV2UI_Handle of the plugin UI instance.
+ * Normally hosts should not need to access the LV2UI_Handle directly,
+ * use the slv2_ui_instance_* functions.
+ *
+ * The returned handle is shared and must not be deleted.
+ */
+SLV2_API
+LV2UI_Handle
+slv2_ui_instance_get_handle(SLV2UIInstance instance);
+
+/** @} */
+/** @} */
+
+#endif /* SLV2_SLV2_UI_H__ */