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+# LV2 CV Port Extension
+# Copyright 2011 David Robillard <http://drobilla.net>
+#
+# 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 cv:   <http://lv2plug.in/ns/ext/cv-port#> .
+@prefix doap: <http://usefulinc.com/ns/doap#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@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#> .
+
+<http://lv2plug.in/ns/ext/cv-port>
+	a lv2:Specification ;
+	doap:license <http://opensource.org/licenses/isc-license> ;
+	doap:name "LV2 CV Port" ;
+	doap:maintainer [
+		a foaf:Person ;
+		foaf:name "David Robillard" ;
+		foaf:homepage <http://drobilla.net/> ;
+		rdfs:seeAlso <http://drobilla.net/drobilla.rdf>
+	] ;
+	lv2:documentation """
+
+This extension defines Control Voltage (CV) ports, which are audio-rate control
+ports like those used on classical voltage-controlled synthesizers.  These
+ports serve as control ports like <a
+href="http://lv2plug.in/ns/lv2core#ControlPort">lv2:ControlPort</a> but can
+also be used for audio-rate modulation of control signals.  This enables many
+types of processing and synthesis which are not possible with a lower control
+rate.
+
+""" .
+
+cv:CVPort
+	a rdfs:Class ;
+	rdfs:label "CV Port" ;
+	rdfs:subClassOf lv2:Port ;
+	lv2:documentation """
+
+Ports of this type have identical semantics to <a
+href="http://lv2plug.in/ns/lv2core#AudioPort">lv2:AudioPort</a> in terms of
+buffer format and connection/input/output logistics.  However, rather than the
+buffer representing audio, the buffer represents audio-rate control data.  A
+CVPort SHOULD have the same properties a <a
+href="http://lv2plug.in/ns/lv2core#ControlPort">lv2:ControlPort</a> typically
+has to describe appropriate control values (e.g.  <a
+href="http://lv2plug.in/ns/lv2core#minimum">lv2:minimum</a>, <a
+href="http://lv2plug.in/ns/lv2core#maximum">lv2:maximum</a>, <a
+href="http://lv2plug.in/ns/lv2core#default">lv2:default</a>)
+
+Hosts SHOULD take care to prevent data from a CVPort port from being used as
+audio except in cases where this is known to be safe.
+
+Example:
+<pre>
+&lt;http://example.org/some-plugin&gt;
+	lv2:port [
+		a cv:CVPort, lv2:InputPort ;
+		lv2:index 0 ;
+		lv2:minimum -1.0 ;
+		lv2:maximum 1.0 ;
+		lv2:default 0.0 ;
+		lv2:symbol "modulation" ;
+		lv2:name "Modulation" ;
+	] .
+</pre>
+""" .