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+# LV2 Atom Port 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 aport: <http://lv2plug.in/ns/ext/atom-port#> .
+@prefix atom:  <http://lv2plug.in/ns/ext/atom#> .
+@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#> .
+@prefix xsd:   <http://www.w3.org/2001/XMLSchema> .
+
+<http://lv2plug.in/ns/ext/atom-port>
+	a lv2:Specification ;
+    doap:name "LV2 Atom Port" ;
+    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 describes port types that hold polymorphic values
+(<a href="http://lv2plug.in/ns/ext/atom#Atom">atom:Atom</a>).  There are
+two such port types with equivalent buffer formats but different semantics:
+value ports (aport:ValuePort) and message ports (aport:MessagePort).
+""" .
+
+
+aport:AtomPort a rdfs:Class ;
+    rdfs:label      "Atom Port" ;
+    rdfs:subClassOf lv2:Port ;
+    rdfs:comment    """
+A port which contains a polymorphic value, or "atom".
+Ports of this type will be connected to a 32-bit aligned <a
+href="http://lv2plug.in/ns/ext/atom#Atom">atom:Atom</a> (i.e. a uint32_t type,
+immediately followed by a uint32_t size, immediately followed by that many
+bytes of data).
+
+This is an abstract port type.  A port that is a aport:AtomPort MUST also
+have a more descriptive type that is a subClassOf aport:AtomPort which
+defines the port's semantics (typically aport:ValuePort or aport:MessagePort).
+
+Before calling a method on the plugin that writes to an AtomPort output,
+the host MUST set the size of the Atom in that output to the amount of
+available memory immediately following the Atom header.  The plugin MUST
+write a valid Atom to that port (leaving it untouched is illegal).  If there
+is no reasonable value to write to the port, the plugin MUST write null
+(the atom with both type and size equal to zero).
+""" .
+
+
+#aport:respondsWith a rdf:Property ;
+#    rdfs:domain  aport:MessagePort ;
+#    rdfs:range   lv2:Symbol ;
+#    rdfs:label   "responds with" ;
+#    rdfs:comment """
+#Indicates that a message port responds to messages via the port with the
+#given symbol on the same plugin instance.  If
+#<pre>input aport:respondsWith output</pre> then after running the plugin with
+#a message <em>m</em> in <code>input</code> the host SHOULD interpret the aport:
+#in <code>output</code> as the response to <em>m</em>.
+#""" .
+
+
+aport:ValuePort a rdfs:Class ;
+    rdfs:label      "Value Port" ;
+    rdfs:subClassOf aport:AtomPort ;
+    rdfs:comment    """
+An AtomPort that interprets its data as a persistent and time-independent
+"value".
+<ul>
+<li>If a plugin has fixed input values for all ports, all ValuePort outputs
+are also fixed regardless of the number of times the plugin is run.</li>
+<li>If a plugin has fixed input values for all ports except a ValuePort,
+each value V of that ValuePort corresponds to a single set of outputs
+for all ports.</li>
+<li>If an aport:ValuePort contains a reference then the blob it refers to is
+constant; plugin MUST NOT modify the blob in any way.</li>
+</ul>
+Value ports can be thought of as purely functional ports: if a plugin
+callback has only value ports, then the plugin callback is a pure function.
+""" .
+
+
+aport:MessagePort a rdfs:Class ;
+    rdfs:label      "Message Port" ;
+    rdfs:subClassOf aport:AtomPort ;
+    rdfs:comment    """
+An AtomPort that consumes or executes its value as a "message".  The contents
+of a MessagePort are considered transient and/or time-dependent, and only
+apply for a single run invocation.  Unlike a ValuePort, a MessagePort may
+be used to manipulate and access internal plugin state.
+
+Intuitively, a MessagePort contains a "command" or "event" (which is reacted
+to), NOT a "value" or "signal" (which is computed with).
+""" .
+
+aport:supports a rdf:Property ;
+	rdfs:domain  lv2:Port ;
+	rdfs:range   atom:AtomType ;
+	rdfs:label   "supports" ;
+	rdfs:comment """
+Indicates that an atom port supports a certain value type.  This is distinct
+from the port type - e.g. the port type ValuePort can hold atoms with many
+different types.  This property is used to describe which atom types
+a port ``understands''.
+""" .
+