diff --git a/catalog/catalog.go b/catalog/catalog.go
index 61c5a5b..0d0c808 100644
--- a/catalog/catalog.go
+++ b/catalog/catalog.go
@@ -14,9 +14,6 @@ type ThingDescription = map[string]interface{}
 const (
 	ResponseContextURL = "https://linksmart.eu/thing-directory/context.jsonld"
 	ResponseType       = "Catalog"
-	// DNS-SD
-	DNSSDServiceType    = "_wot._tcp"
-	DNSSDServiceSubtype = "_directory" // _directory._sub._wot._tcp
 	// Storage backend types
 	BackendMemory  = "memory"
 	BackendLevelDB = "leveldb"
diff --git a/discovery.go b/discovery.go
index 29ade98..af3584d 100644
--- a/discovery.go
+++ b/discovery.go
@@ -12,7 +12,7 @@ import (
 	"github.com/linksmart/go-sec/auth/obtainer"
 	sc "github.com/linksmart/service-catalog/v3/catalog"
 	"github.com/linksmart/service-catalog/v3/client"
-	"github.com/linksmart/thing-directory/catalog"
+	"github.com/linksmart/thing-directory/wot"
 )
 
 // escape special characters as recommended by https://tools.ietf.org/html/rfc6763#section-4.3
@@ -29,7 +29,7 @@ func registerDNSSDService(conf *Config) (func(), error) {
 	instance := escapeDNSSDServiceInstance(conf.DNSSD.Publish.Instance)
 
 	log.Printf("DNS-SD: registering as \"%s.%s.%s\", subtype: %s",
-		instance, catalog.DNSSDServiceType, conf.DNSSD.Publish.Domain, catalog.DNSSDServiceSubtype)
+		instance, wot.DNSSDServiceType, conf.DNSSD.Publish.Domain, wot.DNSSDServiceSubtypeDirectory)
 
 	var ifs []net.Interface
 
@@ -52,7 +52,7 @@ func registerDNSSDService(conf *Config) (func(), error) {
 
 	sd, err := zeroconf.Register(
 		instance,
-		catalog.DNSSDServiceType+","+catalog.DNSSDServiceSubtype,
+		wot.DNSSDServiceType+","+wot.DNSSDServiceSubtypeDirectory,
 		conf.DNSSD.Publish.Domain,
 		conf.HTTP.BindPort,
 		[]string{"td=/td", "version=" + Version},
diff --git a/wot/discovery.go b/wot/discovery.go
new file mode 100644
index 0000000..b2fb2f8
--- /dev/null
+++ b/wot/discovery.go
@@ -0,0 +1,11 @@
+package wot
+
+const (
+	// Media Types
+	MediaTypeJSONLD = "application/ld+json"
+	MediaTypeJSON   = "application/ld+json"
+	// DNS-SD Types
+	DNSSDServiceType             = "_wot._tcp"
+	DNSSDServiceSubtypeThing     = "_thing"     // _thing._sub._wot._tcp
+	DNSSDServiceSubtypeDirectory = "_directory" // _directory._sub._wot._tcp
+)