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+@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
+@prefix doap: <http://usefulinc.com/ns/doap#> .
+@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
+@prefix param: <http://lv2plug.in/ns/ext/parameters#> .
+@prefix patch: <http://lv2plug.in/ns/ext/patch#> .
+@prefix plug: <http://lv2plug.in/plugins/eg-params#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix state: <http://lv2plug.in/ns/ext/state#> .
+@prefix urid: <http://lv2plug.in/ns/ext/urid#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+# An existing parameter or RDF property can be used as a parameter.  The LV2
+# parameters extension <http://lv2plug.in/ns/ext/parameters> defines many
+# common audio parameters.  Where possible, existing parameters should be used
+# so hosts can intelligently control plugins.
+
+# If no suitable parameter exists, one can be defined for the plugin like so:
+
+plug:int
+	a lv2:Parameter ;
+	rdfs:label "int" ;
+	rdfs:range atom:Int .
+
+plug:long
+	a lv2:Parameter ;
+	rdfs:label "long" ;
+	rdfs:range atom:Long .
+
+plug:float
+	a lv2:Parameter ;
+	rdfs:label "float" ;
+	rdfs:range atom:Float .
+
+plug:double
+	a lv2:Parameter ;
+	rdfs:label "double" ;
+	rdfs:range atom:Double .
+
+plug:bool
+	a lv2:Parameter ;
+	rdfs:label "bool" ;
+	rdfs:range atom:Bool .
+
+plug:string
+	a lv2:Parameter ;
+	rdfs:label "string" ;
+	rdfs:range atom:String .
+
+plug:path
+	a lv2:Parameter ;
+	rdfs:label "path" ;
+	rdfs:range atom:Path .
+
+plug:lfo
+	a lv2:Parameter ;
+	rdfs:label "LFO" ;
+	rdfs:range atom:Float ;
+	lv2:minimum -1.0 ;
+	lv2:maximum 1.0 .
+
+plug:spring
+	a lv2:Parameter ;
+	rdfs:label "spring" ;
+	rdfs:range atom:Float .
+
+# Most of the plugin description is similar to the others we have seen, but
+# this plugin has only two ports, for receiving and sending messages used to
+# manipulate and access parameters.
+<http://lv2plug.in/plugins/eg-params>
+	a lv2:Plugin ,
+		lv2:UtilityPlugin ;
+	doap:name "Example Parameters" ;
+	doap:license <http://opensource.org/licenses/isc> ;
+	lv2:project <http://lv2plug.in/ns/lv2> ;
+	lv2:requiredFeature urid:map ;
+	lv2:optionalFeature lv2:hardRTCapable ,
+		state:loadDefaultState ;
+	lv2:extensionData state:interface ;
+	lv2:port [
+		a lv2:InputPort ,
+			atom:AtomPort ;
+		atom:bufferType atom:Sequence ;
+		atom:supports patch:Message ;
+		lv2:index 0 ;
+		lv2:symbol "in" ;
+		lv2:name "In"
+	] , [
+		a lv2:OutputPort ,
+			atom:AtomPort ;
+		atom:bufferType atom:Sequence ;
+		atom:supports patch:Message ;
+		lv2:index 1 ;
+		lv2:symbol "out" ;
+		lv2:name "Out"
+	] ;
+# The plugin must list all parameters that can be written (e.g. changed by the
+# user) as patch:writable:
+	patch:writable plug:int ,
+		plug:long ,
+		plug:float ,
+		plug:double ,
+		plug:bool ,
+		plug:string ,
+		plug:path ,
+		plug:spring ;
+# Similarly, parameters that may change internally must be listed as patch:readable,
+# meaning to host should watch for changes to the parameter's value:
+		patch:readable plug:lfo ,
+			plug:spring ;
+# Parameters map directly to properties of the plugin's state.  So, we can
+# specify initial parameter values with the state:state property.  The
+# state:loadDefaultState feature (required above) requires that the host loads
+# the default state after instantiation but before running the plugin.
+	state:state [
+		plug:int 0 ;
+		plug:long "0"^^xsd:long ;
+		plug:float 0.1234 ;
+		plug:double "0.0"^^xsd:double ;
+		plug:bool false ;
+		plug:string "Hello, world" ;
+		plug:path <params.ttl> ;
+		plug:spring 0.0 ;
+		plug:lfo 0.0
+	] .