# LV2 Polymorphic Port Extension
# Copyright (C) 2008 David Robillard <d@drobilla.net>
#
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@prefix polym: <http://lv2plug.in/ns/ext/polymorphic-port#> .
@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 doap:  <http://usefulinc.com/ns/doap#> .
@prefix foaf:  <http://xmlns.com/foaf/0.1/> .

<http://lv2plug.in/ns/ext/polymorphic-port> a lv2:Specification ;
	doap:license <http://usefulinc.com/doap/licenses/mit> ;
	doap:name "LV2 Polymorphic Ports" ;
	rdfs:comment "Defines LV2 ports which can dynamically change type" ;
	doap:maintainer [
		a foaf:Person ;
		foaf:name "David Robillard" ;
		foaf:homepage <http://drobilla.net/> ;
		rdfs:seeAlso <http://drobilla.net/drobilla.rdf>
	] .


polym:PolymorphicPort a rdfs:Class ;
    rdfs:label      "Polymorphic port" ;
    rdfs:subClassOf lv2:Port ;
    rdfs:comment    """
Ports of this type may be connected to buffers of several types.  The plugin
provides a set_type function for the host to specify which type a port is
currently connected to.

A Port specifies the types it supports using the :supportsType property.
The type specific in the normal LV2 manner (&lt;port&gt; a &lt;sometype&gt;)
is the "default type".  If the port is connected without set_type being called
for that port, the type of the buffer is assumed to be the default type.
In this way polymorphic plugins are backwards compatible and may be used by
hosts which are not aware of the polymorphic port extension.
""" .

polym:generic a lv2:PortProperty ;
	rdfs:label "Generic polymorphic port" ;
	rdfs:comment """
Indicates that this port can be connected to a buffer of any type.
""" .

polym:supportsType a rdf:Property ;
	rdfs:domain  lv2:Port ;
    rdfs:label   "Supports data type" ;
    rdfs:comment """
Indicates that this port supports or "understands" a certain data type.
Hosts MUST NOT connect a port to a buffer unless the port is :generic,
or is described as supporting the type of that buffer with this property.
""" .