diff --git a/src/wanijo/instance/domain.clj b/src/wanijo/instance/domain.clj
index b33fc38..64bee0e 100644
--- a/src/wanijo/instance/domain.clj
+++ b/src/wanijo/instance/domain.clj
@@ -3,7 +3,8 @@
             [wanijo.specs :as specs]
             [wanijo.framework.neo4j :as neo4j]
             [wanijo.schema.domain :as domain-schema]
-            [wanijo.attribute.domain :as domain-attr]))
+            [wanijo.attribute.domain :as domain-attr]
+            [wanijo.tag.domain :as domain-tag]))
 
 (spec/def ::instance
   (spec/keys :req-un [::neo4j/uuid
@@ -33,10 +34,9 @@
                        ::source
                        ::domain-schema/schema])))
 (spec/def ::tags
-  (spec/coll-of
-   (spec/keys :req-un [::neo4j/uuid
-                       ::specs/name
-                       ::specs/created_at])))
+  (spec/coll-of ::domain-tag/tag))
+(spec/def ::contains-schema
+  (spec/keys :req-un [::domain-schema/schema]))
 
 (neo4j/defquery findy-by-schema
   "MATCH (i:instance)-[:of]->(s:schema)
@@ -89,9 +89,7 @@
                    prop-tuples))))
 
 (spec/def ::instance-with-schema
-  (spec/and ::instance
-            (spec/keys :req-un
-                       [::domain-schema/schema])))
+  (spec/merge ::instance ::contains-schema))
 (neo4j/defquery find-by-uuid
   "MATCH (i:instance {uuid:{uuid}})
          -[:of]->(s:schema)
@@ -235,25 +233,14 @@
   (neo4j/exec-query! delete-link
                      {:uuid uuid}))
 
-(neo4j/defquery tags
-  "MATCH (i:instance {uuid:{uuid}})-[:has]->(t:tag)
-   RETURN t
-   ORDER BY t.name")
-(defn tags! [uuid]
-  {:post [(spec/assert ::tags %)]}
-  (neo4j/exec-query! tags
-                     {:uuid uuid}))
-
+(spec/def ::contains-full-information
+  (spec/keys :req-un [::properties
+                      ::links-out
+                      ::links-in
+                      ::tags]))
 (spec/def ::full-instance
-  (spec/and ::instance-with-schema
-            (spec/keys ::req-un [::neo4j/uuid
-                                 ::specs/created-at
-                                 ::specs/updated-at
-                                 ::specs/name
-                                 ::properties
-                                 ::links-out
-                                 ::links-in
-                                 ::tags])))
+  (spec/merge ::instance-with-schema
+              ::contains-full-information))
 (defn full-instance-by-uuid! [uuid]
   {:post [(spec/assert ::full-instance %)]}
   (assoc (find-by-uuid! uuid)
@@ -264,7 +251,7 @@
          :links-in
          (incoming-links! uuid)
          :tags
-         (tags! uuid)))
+         (domain-tag/tags-by-instance! uuid)))
 
 (neo4j/defquery is-starred
   "MATCH (u:user {uuid:{user_uuid}}),
diff --git a/src/wanijo/specs.clj b/src/wanijo/specs.clj
index 72baf25..d7d65ca 100644
--- a/src/wanijo/specs.clj
+++ b/src/wanijo/specs.clj
@@ -12,3 +12,4 @@
 (spec/def ::instance_uuid ::neo4j/uuid)
 (spec/def ::attribute_uuid ::neo4j/uuid)
 (spec/def ::now ::neo4j/date-str)
+(spec/def ::uuid ::neo4j/uuid)
diff --git a/src/wanijo/tag/domain.clj b/src/wanijo/tag/domain.clj
new file mode 100644
index 0000000..8cc291c
--- /dev/null
+++ b/src/wanijo/tag/domain.clj
@@ -0,0 +1,19 @@
+(ns wanijo.tag.domain
+  (:require [clojure.spec.alpha :as spec]
+            [wanijo.specs :as specs]
+            [wanijo.framework.neo4j :as neo4j]))
+
+(spec/def ::name ::specs/req-name)
+(spec/def ::tag
+  (spec/keys :req-un [::specs/uuid
+                      ::specs/created_at
+                      ::name]))
+
+(neo4j/defquery tags-by-instance
+  "MATCH (i:instance {uuid:{uuid}})-[:has]->(t:tag)
+   RETURN t
+   ORDER BY t.name")
+(defn tags-by-instance! [instance-uuid]
+  {:post [(spec/assert (spec/coll-of ::tag) %)]}
+  (neo4j/exec-query! tags-by-instance
+                     {:uuid instance-uuid}))