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+# LV2 Command Extension
+# Copyright (C) 2010 David Robillard <d@drobilla.net>
+# 
+# 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 cmd:  <http://lv2plug.in/ns/ext/command#> .
+@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/command>
+	a lv2:Specification ;
+    doap:name "LV2 Command" ;
+    doap:maintainer [
+        a foaf:Person ;
+        foaf:name     "David Robillard" ;
+        foaf:homepage <http://drobilla.net/> ;
+        rdfs:seeAlso  <http://drobilla.net/drobilla.rdf>
+    ] ;
+	rdfs:comment """
+This extension defines special port types used for controlling and inspecting a
+plugin instance by sending messages/commands and receiving responses to them.
+It also allows plugins to send status updates to the host.  The port types in
+this extension only define an abstract notion of plugin control, not actual
+data types and/or message semantics.  They must be used with some other port
+data type (e.g. event) to define the actual data format of port buffers.
+As a result, this extension can be used in conjunction with any extension
+that defines a port type suitable for controlling plugins.
+""" .
+
+cmd:CommandPort a rdfs:Class ;
+    rdfs:label      "Command Port" ;
+    rdfs:subClassOf lv2:Port ;
+    rdfs:comment    """
+An input port used to control a plugin instance.  A plugin has
+at most 1 CommandPort.  A CommandPort is always an lv2:InputPort.  Hosts or
+UIs send messages to the command port in order to control a plugin instance
+in any way.  This is an abstract port class, the actual format and semantics
+of the port buffer (and messages) are defined by some other port type.
+""" .
+
+cmd:StatusPort a rdfs:Class ;
+    rdfs:label      "Command Port" ;
+    rdfs:subClassOf lv2:Port ;
+    rdfs:comment    """
+An output port used to notify the host about changes to a plugin instance and
+responses to commands.  A plugin has at most 1 StatusPort.  A StatusPort is
+always an lv2:OutputPort.  Any response to a command sent to the CommandPort
+of the plugin will appear in the StatusPort output.  The plugin may also emit
+other messages (i.e. the contents of a StatusPort are not necessarily responses
+to commands).  This is an abstract port class, the actual format and semantics
+of the port buffer (and messages) are defined by some other port type.
+""" .
+