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+@prefix log:  <http://lv2plug.in/ns/ext/log#> .
+@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/log>
+	a lv2:Specification ;
+	rdfs:seeAlso <log.h> ,
+		<lv2-log.doap.ttl> ;
+	lv2:documentation """
+<p>This extension defines a feature, log:log, which allows plugins to print log
+messages with an API much like the standard C printf functions.  This allows,
+for example, plugin logs to be nicely presented to the user in a graphical user
+interface.</p>
+
+<p>Different log levels (e.g. <q>error</q> or <q>information</q>) are defined
+by URI and passed as an LV2_URID.  This document defines the typical levels
+which should be sufficient, but implementations may define and use additional
+levels to suit their needs.</p>
+""" .
+
+log:Entry
+	a rdfs:Class ;
+	rdfs:label "Log Entry" ;
+	lv2:documentation """
+<p>A log entry.  Subclasses of this class can be passed to LV2_Log_Log methods
+to describe the nature of the log message.</p>""" .
+
+log:Error
+	a rdfs:Class ;
+	rdfs:label "Error" ;
+	rdfs:subClassOf log:Entry ;
+	rdfs:comment "An error message." .
+
+log:Note
+	a rdfs:Class ;
+	rdfs:label "Note" ;
+	rdfs:subClassOf log:Entry ;
+	rdfs:comment "An informative message." .
+
+log:Warning
+	a rdfs:Class ;
+	rdfs:label "Warning" ;
+	rdfs:subClassOf log:Entry ;
+	rdfs:comment "A warning message." .
+
+log:Trace
+	a rdfs:Class ;
+	rdfs:label "Trace" ;
+	rdfs:subClassOf log:Entry ;
+	lv2:documentation """
+<p>A debugging trace.  These entries should not be displayed during normal
+operation, but the host may implement an option to display them for debugging
+purposes.</p>
+
+<p>This entry type is special in that it may be written to in a real-time
+thread.  It is assumed that if debug tracing is enabled, real-time
+considerations are not a concern.</p>
+""" .
+
+log:log
+	a lv2:Feature ;
+	lv2:documentation """
+<p>A feature which plugins may use to log messages.  To support this feature,
+the host must pass an LV2_Feature to LV2_Descriptor::instantiate() with URI
+LV2_LOG__log and data pointed to an instance of LV2_Log_Log.</p>
+""" .