diff --git a/app/models/synapse.rb b/app/models/synapse.rb
index c42123c9..d6d08bbe 100644
--- a/app/models/synapse.rb
+++ b/app/models/synapse.rb
@@ -53,7 +53,7 @@ class Synapse < ApplicationRecord
 
   def as_rdf
     output = ''
-    output += %(d:synapse_#{id} a mm:synapse ;\n)
+    output += %(d:synapse_#{id} a mm:Synapse ;\n)
     output += %(  mm:topic1 d:topic_#{topic1_id} ;\n)
     output += %(  mm:topic2 d:topic_#{topic2_id} ;\n)
     output += %(  mm:direction "#{category}" ;\n)
diff --git a/app/models/topic.rb b/app/models/topic.rb
index fecad233..2273fd7e 100644
--- a/app/models/topic.rb
+++ b/app/models/topic.rb
@@ -84,7 +84,7 @@ class Topic < ApplicationRecord
 
   def as_rdf
     output = ''
-    output += %(d:topic_#{id} a mm:topic ;\n)
+    output += %(d:topic_#{id} a mm:Topic ;\n)
     output += %(  rdfs:label "#{name}" ;\n)
     output += %(  rdfs:comment "#{desc}" ;\n) if desc.present?
     output += %(  foaf:homepage <#{link}> ;\n) if link.present?
diff --git a/public/owl/map.owl.ttl b/public/owl/map.owl.ttl
index 95fc7b6f..22051709 100644
--- a/public/owl/map.owl.ttl
+++ b/public/owl/map.owl.ttl
@@ -9,26 +9,34 @@
 : a owl:Ontology ;
 	rdfs:label "Metamaps Map"@en .
 
-mm:topic a owl:Class ;
-	rdfs:label "One concept on a metamap"@en .
+mm:Topic a owl:Class ;
+	rdfs:label "One topic on a metamap"@en .
 
-mm:synapse a owl:Class ;
+mm:Synapse a owl:Class ;
   rdfs:label "Link between two topics on a metamap"@en .
 
 mm:topic1 a owl:ObjectProperty ;
 	a owl:FunctionalProperty ;
 	rdfs:label "first topic of a synapse"@en ;
-	rdfs:domain mm:topic ;
-	rdfs:range owl:Thing .
+	rdfs:domain mm:Synapse ;
+	rdfs:range mm:Topic .
 
 mm:topic2 a owl:ObjectProperty ;
 	a owl:FunctionalProperty ;
 	rdfs:label "second topic of a synapse"@en ;
-	rdfs:domain mm:topic ;
+	rdfs:domain mm:Topic ;
 	rdfs:range owl:Thing .
 
-mm:direction a owl:objectProprty ;
+mm:mapper a owl:ObjectProperty ;
+  a owl:FunctionalProperty ;
+  rdfs:label "Metamaps user who created this topic"@en ;
+  rdfs:domain mm:Topic ;
+  rdfs:range foaf:OnlineAccount .
+
+mm:direction a owl:ObjectProprty ;
   a owl:FunctionalProperty ;
   rdfs:label "from-to, both, or none"@en ;
-  rdfs:domain mm:synapse ;
-  rdfs:range xsd:string .
+  rdfs:domain mm:Synapse ;
+  rdfs:range [ owl:oneOf mm:from-to, mm:both, mm:none ] .
+
+mm:frome-to a owl: