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-# LV2 Contexts Extension
-#
-# Allows for an LV2 plugin to have several independent contexts, each with its
-# own run callback and associated ports.
-#
-# Copyright (C) 2007-2010 David Robillard
-#
-# Permission is hereby granted, free of charge, to any person obtaining a
-# copy of this software and associated documentation files (the "Software"),
-# to deal in the Software without restriction, including without limitation
-# the rights to use, copy, modify, merge, publish, distribute, sublicense,
-# and/or sell copies of the Software, and to permit persons to whom the
-# Software is furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included
-# in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-# OTHER DEALINGS IN THE SOFTWARE.
-
-@prefix ctx: <http://lv2plug.in/ns/ext/contexts#> .
-@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
-@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
-@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
-@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
-@prefix doap: <http://usefulinc.com/ns/doap#> .
-@prefix foaf: <http://xmlns.com/foaf/0.1/> .
-
-<http://lv2plug.in/ns/ext/contexts>
- a lv2:Specification , lv2:Feature ;
- doap:name "LV2 Contexts" ;
- doap:shortdesc "Support for plugins with several execution contexts." ;
- lv2:documentation """
-<p>An extension for LV2 plugins which have several execution contexts.</p>
-
-<p>Contexts allow plugins to run tasks and/or process input/output in
-multiple threads. Contexts can be used to add non-realtime functionality
-to a plugin while still keeping the audio run() method realtime safe.</p>
-
-<p>A context is an LV2 feature, so the usual LV2 feature mechanism is used
-to determine whether a plugin has a given context, and whether or not it is
-mandatory.</p>
-
-<p>Unless otherwise stated, each context (defined by some URI) adds a new
-threading class similar to the Audio class defined by LV2. Each context has a
-run callback and a connect_port callback both in the same class (i.e. can't be
-called concurrently), but may be called concurrently with functions for other
-contexts (excluding the Instantiation class). Context properties such as
-ctx:hardRTCapable apply to both functions.
-The host MUST only call the correct connect_port function associated with the
-context for that port, i.e. it is an error to use the main LV2 connect_port
-function on a port with a context other than the main LV2 run function.</p>
-""" .
-
-
-##########################
-## Context Base Classes ##
-##########################
-
-ctx:Context a rdfs:Class ;
- rdfs:label "LV2 Context" ;
- lv2:documentation """
-<p>A potentially concurrent context (callback) on a plugin.</p>
-
-<p>Ports are always associated with a context. If a port has no explicit context
-property, then its context is ctx:audioContext (the default LV2 run() context).</p>
-
-<p>A plugin indicates support for a context by supporting an LV2 Feature with
-that context's URI. If a plugin optionally supports a context (e.g.
-<code>&lt;plugin&gt; lv2:optionalFeature ctx:idleContext .</code>), then
-all ports associated with that context MUST be lv2:connectionOptional. Thus,
-hosts that do not support contexts will connect such ports to NULL and the
-plugin can run with only a standard LV2 run() context.</p>
-
-<p>Any plugin that supports any context (optionally or mandatorily) MUST adhere
-to the following additional threading rules for LV2_Descriptor.connect_port:</p>
-<ul>
-<li>connect_port MUST only be called for a given port from the context
-associated with that port</li>
-<li>connect_port MAY be called concurrently for ports with different
-contexts (but MUST NOT be called concurrently for multiple ports in the
-same context)</li>
-</ul>
-<p>Note this implies that any shared data access in connect_port may be
-accessed concurrently. The plugin is responsible for any synchronisation
-or locking necessary to make this possible.</p>
-""" .
-
-ctx:audioContext a ctx:Context , lv2:Feature ;
- rdfs:comment """The context of LV2_Descriptor.run().""" .
-
-ctx:messageContext a ctx:Context , lv2:Feature ;
- lv2:documentation """
-<p>A non-realtime context for plugin control via message passing. This context
-has a run method which takes a bitset of flags for parameters specifying which
-input and output ports are valid before and after the run method has executed,
-respectively (see <code>LV2_Contexts_MessageContext</code>).</p>
-""" .
-
-ctx:idleContext a ctx:Context , lv2:Feature ;
- rdfs:comment """
-A non-realtime idle context, periodically run by the host roughly every second.
-This context never has any ports.
-""" .
-
-ctx:requestRunFeature a lv2:Feature ;
- lv2:documentation """
-<p>A feature allowing the plugin to request the execution of a particular
-context at an arbitrary time. To support this feature, the host MUST pass an
-LV2_Feature to <code>instantiate</code> with <code>data</code> pointing to a
-LV2_Contexts_Request_Run_Feature.</p>
-
-<p>The plugin MAY call <code>request_run</code> with the given
-<code>data</code> from any non-realtime context to demand soon-as-possible execution
-of the specified context.</p>
-""" .
-
-ctx:context a rdf:Property ;
- rdfs:domain lv2:Port ;
- rdfs:range ctx:Context ;
- rdfs:label "is used in context" ;
- rdfs:comment """
-The context a particular port is associated with; the port will only be
-connected/read/written by that context.
-
-If no context is specified, the port is considered part of the default LV2
-audio context.""" .
-
-