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+@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> ;
+ rdfs:seeAlso <ui.h> ,
+ <lv2-ui.doap.ttl> ;
+ lv2:documentation """
+<p>This extension is used to create User Interfaces (UIs) for LV2 plugins.</p>
+
+<p>UIs are implemented as an LV2UI_Descriptor loaded via lv2ui_descriptor() in
+a shared library, and are distributed in bundles just like plugins.</p>
+
+<p>UIs are associated with plugins in data:</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 MUST NOT
+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>UI functionality may be extended via features, much like plugins:</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. This extension defines several standard features for
+common functionality.</p>
+
+<p>UIs written to this specification do not need to be thread-safe. All
+functions may only be called in the <q>UI thread</q>. There is only one UI
+thread (for toolkits, the one the UI main loop runs in). There is no
+requirement that a <q>UI</q> actually be a graphical widget.</p>
+
+<p>Note that UIs are completely separate from plugins. From the plugin's
+perspective, control from a UI is indistinguishable from any other control, as
+it all occcurs via ports.</p>
+""" .
+
+ui:UI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:label "User Interface" ;
+ rdfs:comment "A UI for an LV2 plugin" .
+
+ui:GtkUI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:label "GTK2 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:Gtk3UI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:label "GTK3 UI" ;
+ rdfs:comment """A UI where the LV2_Widget is a pointer to a Gtk+ 3.0 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:label "Qt4 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:Qt5UI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:label "Qt5 UI" ;
+ rdfs:comment """A UI where the LV2_Widget is a pointer to a Qt5 compatible QWidget, and the host guarantees that the Qt5 library has been initialised and the Qt5 main loop is running before a UI of this type is instantiated.""" .
+
+ui:X11UI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:label "X11 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. This is the native UI type on most POSIX systems.""" .
+
+ui:WindowsUI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:label "Windows UI" ;
+ rdfs:comment """A UI where the LV2_Widget is a Windows HWND window ID. Note this is actually an unsigned 32-bit integer, i.e. the LV2_Widget is not a pointer to a HWND but should be interpreted as an HWND itself. This is the native UI type on Microsoft Windows.""" .
+
+ui:CocoaUI
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf ui:UI ;
+ rdfs:label "Cocoa UI" ;
+ rdfs:comment """A UI where the LV2_Widget is a pointer to a NSView, the basic view type for the Cocoa API (formerly OpenStep). This is the native UI type on Mac OS X.""" .
+
+ui:ui
+ a rdf:Property ;
+ rdfs:domain lv2:Plugin ;
+ rdfs:range ui:UI ;
+ rdfs:label "user interface" ;
+ rdfs:comment """Relates a plugin to a UI that applies to it.""" .
+
+ui:binary
+ a rdf:Property ;
+ owl:sameAs lv2:binary ;
+ owl:deprecated "true"^^xsd:boolean ;
+ rdfs:label "binary" ;
+ rdfs:comment """The shared library a UI resides in. This property is redundant, new UIs SHOULD use lv2:binary, however hosts MUST still support ui:binary at this time.""" .
+
+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,-z,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:parent
+ a lv2:Feature ;
+ lv2:documentation """
+<p>The parent for the UI.</p>
+
+<p>This feature can be used to pass a parent (e.g. a widget, container, canvas,
+etc.) the UI should be a child of. The format of data pointer of this feature
+is determined by the UI type, and is generally the same type as the LV2_Widget
+the UI would return (e.g. for a GtkUI the data would be a pointer to a
+GtkWidget which is a GtkContainer). This is particularly useful for
+cross-toolkit embedding, where the parent often must be known at construction
+time for embedding to work correctly. UIs should not require this feature
+unless it is absolutely necessary for them to work at all.</p>
+""" .
+
+ui:PortNotification
+ a rdfs:Class ,
+ owl:Class ;
+ rdfs:subClassOf [
+ a owl:Restriction ;
+ owl:onProperty ui:plugin ;
+ owl:cardinality 1 ;
+ rdfs:comment "A PortNotification MUST have exactly one ui:plugin." ;
+ ] ;
+ lv2:documentation """
+<p>A port notification. This describes which ports the host must send
+notifications to the UI about. The port can be specific by index, using the
+ui:portIndex property, or symbol, using the lv2:symbol property. Since port
+indices are not guaranteed to be stable between different revisions (or even
+instantiations) of a plugin, symbol is recommended, and index may only be used
+by UIs shipped in the same bundle as the plugin.</p>
+
+<p>A ui:PortNotification MUST have either a ui:portIndex or a lv2:symbol to
+indicate which port it refers to.</p>
+""" .
+
+ui:portNotification
+ a rdf:Property ,
+ owl:ObjectProperty ;
+ rdfs:domain ui:UI ;
+ rdfs:range ui:PortNotification ;
+ rdfs:label "port notification" ;
+ lv2:documentation """
+<p>Indicates that a UI should receive notification (via
+LV2UI_Descriptor::port_event()) when a particular port's value changes.</p>
+
+<p>For example:</p>
+<pre class="turtle-code">
+eg:ui
+ a ui:GtkUI ;
+ ui:portNotification [
+ ui:plugin eg:plugin ;
+ lv2:symbol "gain" ;
+ ui:protocol ui:floatProtocol
+ ] .
+</pre>
+""" .
+
+ui:plugin
+ a rdf:Property ,
+ owl:ObjectProperty ;
+ rdfs:domain ui:PortNotification ;
+ rdfs:range lv2:Plugin ;
+ rdfs:label "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:label "port index" ;
+ rdfs:comment "The index of the port a portNotification applies to." .
+
+ui:notifyType
+ a rdf:Property ;
+ rdfs:domain ui:PortNotification ;
+ rdfs:label "notify type" ;
+ lv2:documentation """
+<p>Indicates a particular type that the UI should be notified of. In the case
+of ports where several types of data can be present (e.g. event ports), this
+can be used to indicate that only a particular type of data should cause
+notification. This is useful where port traffic is very dense, but only a
+certain small number of events are actually of interest to the UI.</p>
+""" .
+
+ui:resize
+ a lv2:Feature ,
+ lv2:ExtensionData ;
+ lv2:documentation """
+<p>A feature that allows the UI to notify the host about its current size, or
+request a size change. This feature corresponds to the LV2UI_Resize struct,
+which should be passed with the URI LV2_UI__resize. This struct may also be
+provided by the UI as extension data using the same URI, in which case it is
+used by the host to request that the UI change its size.</p>
+""" .
+
+ui:portMap
+ a lv2:Feature ;
+ lv2:documentation """
+<p>A feature for accessing the index of a port by symbol. This makes it
+possible to implement and distribute UIs separately from the plugin binaries
+they control. This feature corresponds to the LV2UI_Port_Index struct, which
+should be passed with the URI LV2_UI__portIndex.</p>
+""" .
+
+ui:portSubscribe
+ a lv2:Feature ;
+ lv2:documentation """
+<p>A feature for dynamically subscribing to updates from a port. This makes it
+possible for a UI to explicitly request a particular style of update from a
+port at run-time, in a more flexible and powerful way than listing
+subscriptions statically allows. This feature corresponds to the
+LV2UI_Port_Subscribe struct, which should be passed with the URI
+LV2_UI__portSubscribe.</p>
+""" .
+
+ui:touch
+ a lv2:Feature ;
+ lv2:documentation """
+<p>A feature to notify the host that the user has grabbed a particular port
+control. This is useful for automation, so the host can allow the user to take
+control of a port, even if that port would otherwise be automated (much like
+grabbing a physical morotised fader). It can also be used for MIDI learn or in
+any other situation where the host needs to do something with a particular
+control and it would be convenient for the user to select it directly from the
+plugin UI. This feature corresponds to the LV2UI_Touch struct, which
+should be passed with the URI LV2_UI__touch.</p>
+""" .
+
+ui:idleInterface
+ a lv2:Feature ,
+ lv2:ExtensionData ;
+ lv2:documentation """
+<p>A feature that provides a callback for the host to call rapidly to drive the
+UI. To support this feature, the UI should list it as a lv2:optionalFeature or
+lv2:requiredFeature in its data, and also as lv2:extensionData. When the UI's
+extension_data() is called with this URI (LV2_UI__idleInterface), it should
+return a pointer to an LV2UI_Idle_Interface.</p>
+
+<p>To indicate support, the host should pass a feature to instantiate() with
+this URI, with NULL for data.</p>
+""" .
+
+ui:showInterface
+ a lv2:ExtensionData ;
+ lv2:documentation """
+<p>An interface for showing and hiding a window for a UI. This allows UIs to
+gracefully degrade to separate windows when the host is unable to embed the UI
+widget for whatever reason. When the UI's extension_data() is called with this
+URI (LV2_UI__showInterface), it should return a pointer to an
+LV2UI_Show_Interface.</p>
+""" .
+
+ui:windowTitle
+ a rdf:Property ;
+ rdfs:range xsd:string ;
+ rdfs:label "window title" ;
+ rdfs:comment "The title for the window shown by LV2UI_Show_Interface." .
+
+ui:updateRate
+ a rdf:Property ;
+ rdfs:range xsd:float ;
+ rdfs:label "update rate" ;
+ rdfs:comment "The target rate, in Hz, to send updates to the UI." .
+
+ui:protocol
+ a rdf:Property ;
+ rdfs:domain ui:PortNotification ;
+ rdfs:range ui:PortProtocol ;
+ rdfs:label "protocol" ;
+ rdfs:comment "The protocol to be used for this notification." .
+
+ui:PortProtocol
+ a rdfs:Class ;
+ rdfs:subClassOf lv2:Feature ;
+ rdfs:label "Port Protocol" ;
+ lv2:documentation """
+<p>A PortProtocol defines a method to communicate port data between a UI and
+plugin.</p>
+
+<p>Any PortProtocol MUST define:</p>
+<table>
+<tr><th>Port Type</th>
+ <td>Which plugin port types the buffer type is valid for.</td></tr>
+<tr><th>Feature Data</th>
+ <td>What data (if any) should be passed in the LV2_Feature.</td></tr>
+</table>
+
+<p>Any PortProtocol for an output port MUST define:</p>
+<table>
+<tr><th>Update Frequency</th>
+ <td>When the host should call port_event().</td></tr>
+<tr><th>Update Format</th>
+ <td>The format of the data in the buffer passed to port_event().</td></tr>
+<tr><th>Options</th>
+ <td>The format of the options passed to subscribe() and unsubscribe().</td>
+</tr></table>
+
+<p>Any PortProtocol for an input port MUST define:</p>
+<table>
+<tr><th>Write Format</th>
+ <td>The format of the data in the buffer passed to write_port().</td></tr>
+<tr><th>Write Effect</th>
+ <td>What happens when the UI calls write_port().</td></tr>
+</table>
+
+<p>For an example, see ui:floatProtocol or ui:peakProtocol.
+</p>
+
+<p>PortProtocol is a subclass of lv2:Feature, so UIs use lv2:optionalFeature and
+lv2:requiredFeature to specify which PortProtocols they want to use.
+</p>
+""" .
+
+ui:floatProtocol
+ a ui:PortProtocol ;
+ rdfs:label "floating point value" ;
+ lv2:documentation """
+
+<p>A protocol for transferring single floating point values. The rules for
+this protocol are:</p>
+<table>
+<tr><th>Port Type</th>
+ <td>lv2:ControlPort</td></tr>
+<tr><th>Feature Data</th>
+ <td>None.</td></tr>
+<tr><th>Update Frequency</th>
+ <td>The host SHOULD call port_event() as soon as possible when the port
+ value has changed, but there are no timing guarantees.</td></tr>
+<tr><th>Update Format</th>
+ <td>A single <code>float</code>.</td></tr>
+<tr><th>Options</th>
+ <td>None.</td></tr>
+<tr><th>Write Format</th>
+ <td>A single <code>float</code>.</td></tr>
+<tr><th>Write Effect</th>
+ <td>The host SHOULD set the port to the received value as soon as possible,
+ but there is no guarantee that run() actually sees this value.</td></tr>
+</table>
+""" .
+
+ui:peakProtocol
+ a ui:PortProtocol ;
+ rdfs:label "peak measurement for a period of audio" ;
+ lv2:documentation """
+<p>This port protocol defines a way for the host to send continuous peak
+measurements of the audio signal at a certain port to the UI. The
+intended use is visualisation, e.g. an animated meter widget that shows
+the level of the audio input or output.</p>
+
+<p>A contiguous sequence of audio samples for which a peak value has been
+computed is called a <em>measurement period</em>.</p>
+
+<p>The rules for this protocol are:</p>
+<table>
+<tr><th>Port Type</th>
+ <td>lv2:AudioPort</td></tr>
+<tr><th>Feature Data</th>
+ <td>None.</td></tr>
+<tr><th>Update Frequency</th>
+ <td>The host SHOULD call port_event() at regular intervals. The
+ measurement periods used for calls to port_event() for the same port SHOULD
+ be contiguous (i.e. the measurement period for one call should begin right
+ after the end of the measurement period for the previous call ends) unless
+ the UI has removed and re-added the port subscription between those calls.
+ However, UIs MUST NOT depend on either the regularity of the calls or the
+ contiguity of the measurement periods; hosts may change the call rate or
+ skip calls for performance or other reasons. Measurement periods for
+ different calls to port_event() for the same port MUST NOT
+ overlap.</td></tr>
+<tr><th>Update Format</th>
+ <td>A single LV2UI_Peak_Data object.</td></tr>
+<tr><th>Options</th>
+ <td>None.</td></tr>
+<tr><th>Write Format</th>
+ <td>None.</td></tr>
+<tr><th>Write Effect</th>
+ <td>None.</td></tr>
+</table>
+""" .