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+# LV2 UI Extension
+# Copyright 2009-2011 David Robillard <d@drobilla.net>
+# Copyright 2006-2008 Lars Luthman <lars.luthman@gmail.com>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+@prefix doap: <http://usefulinc.com/ns/doap#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix ui: <http://lv2plug.in/ns/extensions/ui#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+<http://lv2plug.in/ns/extensions/ui>
+ a owl:Ontology ;
+ owl:imports <http://lv2plug.in/ns/lv2core> ;
+ lv2:documentation """
+<p>This extension defines an interface that can be used in LV2 plugins and
+hosts to create UIs for plugins. The UIs are similar to plugins and reside in
+shared object files in an LV2 bundle. UIs are associated with a plugin in RDF
+using the triples:</p>
+
+<pre class="turtle-code">
+@prefix ui: &lt;http://lv2plug.in/ns/extensions/ui#&gt; .
+
+&lt;http://my.plugin&gt; ui:ui &lt;http://my.pluginui&gt; .
+&lt;http://my.pluginui&gt; a ui:GtkUI ;
+ ui:binary &lt;myui.so&gt; .
+</pre>
+
+<p>where &lt;http://my.plugin&gt; is the URI of the plugin,
+&lt;http://my.pluginui&gt; is the URI of the plugin UI and &lt;myui.so&gt; is
+the relative URI to the shared object file.</p>
+
+<p>While it is possible to have the plugin UI and the plugin in the same shared
+object file it is probably a good idea to keep them separate so that hosts that
+don't want UIs don't have to load the UI code. A UI MUST specify its class in
+the RDF data (ui:GtkUI in the above example). The class defines what type the
+UI is, e.g. what graphics toolkit it uses. Any type of UI class can be defined
+separately from this extension.</p>
+
+<p>It is possible to have multiple UIs for the same plugin, or to have the UI
+for a plugin in a different bundle from the actual plugin - this way people
+other than the plugin author can write plugin UIs independently without editing
+the original plugin bundle.</p>
+
+<p>Note that the process that loads the shared object file containing the UI
+code and the process that loads the shared object file containing the actual
+plugin implementation are not necessarily the same process (and not even
+necessarily on the same machine). This means that plugin and UI code can
+<strong>not</strong> use singletons and global variables and expect them to
+refer to the same objects in the UI and the actual plugin. The function
+callback interface defined in this header is the only method of communication
+between UIs and plugin instances (extensions may define more, though this is
+discouraged unless absolutely necessary since the significant benefits of
+network transparency and serialisability are lost).</p>
+
+<p>Since the LV2 specification itself allows for extensions that may add new
+functionality that could be useful to control with a UI, this extension allows
+for meta-extensions that can extend the interface between the UI and the
+host. These extensions mirror the extensions used for plugins - there are
+required and optional "features" that you declare in the RDF data for the
+UI:</p>
+
+<pre class="turtle-code">
+&lt;http://my.pluginui&gt; lv2:requiredFeature &lt;http://my.feature&gt; .
+&lt;http://my.pluginui&gt; lv2:optionalFeature &lt;http://my.feature&gt; .
+</pre>
+
+<p>The rules for a UI with a required or optional feature are identical to
+those of lv2:Plugin instances: if a UI declares a feature as required, the host
+is NOT allowed to load it unless it supports that feature; and if it does
+support a feature, it MUST pass an appropriate LV2_Feature struct to the UI's
+instantiate() method. These features may be used to specify how to pass
+specific types of data between the UI and the plugin port buffers (see
+LV2UI_Write_Function for details).</p>
+
+<p>UIs written to this specification do not need to be threadsafe - the
+functions defined below may only be called in the same thread the UI main loop
+is running in.</p>
+
+<p>Note that this UI extension is NOT a lv2:Feature. There is no way for a
+plugin to know whether the host that loads it supports UIs or not, and the
+plugin must always work without the UI (although it may be rather useless
+unless it has been configured using the UI in a previous session). From the
+plugin perspective, control from a UI is the same as control from anywhere else
+(e.g. the host, the user): via ports.</p>
+
+<p>A UI does not have to be a graphical widget, it could just as well be a
+server listening for OSC input or an interface to some sort of hardware device,
+depending on the RDF class of the UI.</p>
+""" .
+
+ui:UI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf lv2:Resource ;
+ rdfs:label "LV2 UI" ;
+ rdfs:comment "A UI for an LV2 plugin" .
+
+ui:GtkUI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:comment """
+A UI where the LV2_Widget is a pointer to a Gtk+ 2.0 compatible GtkWidget,
+and the host guarantees that the Gtk+ library has been initialised and the
+Glib main loop is running before a UI of this type is instantiated.""" .
+
+ui:Qt4UI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:comment """
+A UI where the LV2_Widget is a pointer to a Qt4 compatible QWidget,
+and the host guarantees that the Qt4 library has been initialised and the
+Qt4 main loop is running before a UI of this type is instantiated.""" .
+
+ui:X11UI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:comment """
+A UI where the LV2_Widget is an X11 window ID. Note this is actually an
+integer, i.e. the LV2_Widget is not a pointer to an X11 window ID, but should
+be itself taken as an integer value.""" .
+
+ui:makeSONameResident
+ a lv2:Feature ;
+ owl:deprecated "true"^^xsd:boolean ;
+ lv2:documentation """
+<p>DEPRECATED</p>
+
+<p>This feature was intended to support UIs that link against toolkit
+libraries which may not be unloaded during the lifetime of the host.
+This is better achieved by using the appropriate flags when linking the
+UI, e.g. <code>gcc -Wl,nodelete</code>.</p>
+""" .
+
+ui:noUserResize
+ a lv2:Feature ;
+ lv2:documentation """
+<p>If a UI requires this feature it indicates that it does not make sense
+to let the user resize the main widget, and the host should prevent that.
+This feature may not make sense for all UI types. The data pointer for the
+LV2_Feature for this feature should always be set to NULL.</p>
+""" .
+
+ui:fixedSize
+ a lv2:Feature ;
+ lv2:documentation """
+<p>If a UI requires this feature it indicates the same thing as
+ui:noUserResize, and additionally it means that the UI will not resize
+the main widget on its own - it will always remain the same size (e.g. a
+pixmap based GUI). This feature may not make sense for all UI types.
+The data pointer for the LV2_Feature for this feature should always be set
+to NULL.</p>
+""" .
+
+ui:PortNotification
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf [
+ a owl:Restriction ;
+ owl:onProperty ui:plugin ;
+ owl:someValuesFrom lv2:Plugin ;
+ owl:cardinality 1 ;
+ rdfs:comment """
+A PortNotification MUST have exactly one ui:plugin which is a lv2:Plugin.
+"""
+ ] , [
+ a owl:Restriction ;
+ owl:onProperty ui:portIndex ;
+ owl:someValuesFrom xsd:decimal ;
+ owl:cardinality 1 ;
+ rdfs:comment """
+A PortNotification MUST have exactly one ui:portIndex which is an xsd:decimal.
+"""
+ ] ;
+ rdfs:comment "Port Notification" .
+
+ui:portNotification
+ a rdf:Property ,
+ owl:ObjectProperty ;
+ rdfs:domain ui:UI ;
+ rdfs:range ui:PortNotification ;
+ lv2:documentation """
+<p>Indicates that a UI should receive notification (via
+LV2UI_Descriptor::port_event()) when a particular port's value changes.</p>
+""" .
+
+ui:plugin
+ a rdf:Property ,
+ owl:ObjectProperty ;
+ rdfs:domain ui:PortNotification ;
+ rdfs:range lv2:Plugin ;
+ rdfs:comment """
+The plugin a portNotification applies to.
+""" .
+
+ui:portIndex
+ a rdf:Property ,
+ owl:DatatypeProperty ;
+ rdfs:domain ui:PortNotification ;
+ rdfs:range xsd:decimal ;
+ rdfs:comment """
+The index of the port a portNotification applies to.
+""" .