diff --git a/src/wanijo/instance/db.clj b/src/wanijo/instance/db.clj
index 2f73edc..327ad45 100644
--- a/src/wanijo/instance/db.clj
+++ b/src/wanijo/instance/db.clj
@@ -1,33 +1,9 @@
 (ns wanijo.instance.db
   (:require [clojure.spec.alpha :as spec]
-            [wanijo.specs :as specs]
             [wanijo.infrastructure.neo4j :as neo4j]
-            [wanijo.schema.db :as domain-schema]
-            [wanijo.attribute.domain :as domain-attr]
-            [wanijo.tag.db :as db-tag]
-            [wanijo.link.db :as db-link]))
+            [wanijo.instance.domain :as domain-instance]
+            [wanijo.tag.db :as db-tag]))
 
-(spec/def ::instance
-  (spec/keys :req-un [::neo4j/uuid
-                      ::specs/created_at
-                      ::specs/updated_at
-                      ::specs/name]))
-(spec/def ::properties
-  (spec/coll-of
-    (spec/keys :req-un [::neo4j/uuid
-                        ::specs/created_at
-                        ::specs/updated_at
-                        ::domain-attr/attribute])))
-(spec/def ::target ::instance)
-(spec/def ::source ::instance)
-(spec/def ::tags
-  (spec/coll-of ::db-tag/tag))
-(spec/def ::contains-schema
-  (spec/keys :req-un [::domain-schema/schema]))
-
-(spec/def ::instances-with-tags
-  (spec/coll-of (spec/merge ::instance
-                            (spec/keys :req-un [::tags]))))
 (neo4j/defquery findy-by-schema
   "MATCH (i:instance)-[:of]->(s:schema)
    WHERE s.uuid = {uuid}
@@ -35,7 +11,7 @@
          (i)-[:tagged_with]->(t:tag)
    RETURN i, t")
 (defn find-by-schema! [schema-uuid]
-  {:post [(spec/assert ::instances-with-tags %)]}
+  {:post [(spec/assert ::domain-instance/instances-with-tags %)]}
   (->> (neo4j/exec-query! findy-by-schema
                           {:uuid schema-uuid})
        (group-by :i)
@@ -84,13 +60,11 @@
            (concat [instance-tuple]
                    prop-tuples))))
 
-(spec/def ::instance-with-schema
-  (spec/merge ::instance ::contains-schema))
 (neo4j/defquery find-by-uuid
   "MATCH (i:instance {uuid:{uuid}})-[:of]->(s:schema)
    RETURN i, s")
 (defn find-by-uuid! [uuid]
-  {:post [(spec/assert ::instance-with-schema %)]}
+  {:post [(spec/assert ::domain-instance/instance-with-schema %)]}
   (->> (neo4j/exec-query! find-by-uuid
                           {:uuid uuid})
        (map #(assoc (:i %)
@@ -111,15 +85,6 @@
        (neo4j/exec-query! find-properties
                           {:uuid uuid})))
 
-(spec/def ::prop-tuple-values
-  (spec/keys :req-un [::neo4j/uuid
-                      ::specs/now
-                      ::value
-                      ::specs/instance_uuid
-                      ::specs/attribute_uuid]))
-(spec/def ::prop-tuple
-  (spec/coll-of
-    (spec/tuple fn? ::prop-tuple-values)))
 (neo4j/defquery edit-instance
   "MATCH (i:instance {uuid:{uuid}})
      SET i.name = {name},
@@ -135,7 +100,7 @@
    ON MATCH SET p.updated_at = {now},
                 p.value = {value}")
 (defn instance->prop-tuples [instance]
-  {:post [(spec/assert ::prop-tuple %)]}
+  {:post [(spec/assert ::domain-instance/prop-tuple %)]}
   (map (fn [prop]
          (let [prop-uuid (:uuid prop)
                uuid (if (empty? prop-uuid)
@@ -192,12 +157,6 @@
                       #(-> % direction :name)
                       #(-> % direction :created_at)))))
 
-(spec/def ::links-out
-  (spec/coll-of
-    (spec/keys :req-un [::db-link/link
-                        ::target
-                        ::domain-schema/schema
-                        ::tags])))
 (neo4j/defquery outgoing-links
   "MATCH (inst:instance {uuid:{uuid}}),
          (inst)<-[:link_from]-(link:link),
@@ -207,15 +166,9 @@
          (target)-[:tagged_with]->(tag:tag)
    RETURN link, target, schema, tag")
 (defn outgoing-links! [uuid]
-  {:post [(spec/assert ::links-out %)]}
+  {:post [(spec/assert ::domain-instance/links-out %)]}
   (group-by-link-and-assoc-tags uuid outgoing-links :target))
 
-(spec/def ::links-in
-  (spec/coll-of
-    (spec/keys :req-un [::db-link/link
-                        ::source
-                        ::domain-schema/schema
-                        ::tags])))
 (neo4j/defquery incoming-links
   "MATCH (inst:instance {uuid:{uuid}}),
          (inst)<-[:link_to]-(link:link),
@@ -226,19 +179,11 @@
    RETURN link, source, schema, tag
    ORDER BY schema.name, source.name, source.created_at")
 (defn incoming-links! [uuid]
-  {:post [(spec/assert ::links-in %)]}
+  {:post [(spec/assert ::domain-instance/links-in %)]}
   (group-by-link-and-assoc-tags uuid incoming-links :source))
 
-(spec/def ::contains-full-information
-  (spec/keys :req-un [::properties
-                      ::links-out
-                      ::links-in
-                      ::tags]))
-(spec/def ::full-instance
-  (spec/merge ::instance-with-schema
-              ::contains-full-information))
 (defn full-instance-by-uuid! [uuid]
-  {:post [(spec/assert ::full-instance %)]}
+  {:post [(spec/assert ::domain-instance/full-instance %)]}
   (assoc (find-by-uuid! uuid)
          :properties
          (find-properties! uuid)
diff --git a/src/wanijo/instance/domain.clj b/src/wanijo/instance/domain.clj
new file mode 100644
index 0000000..d0a0fbe
--- /dev/null
+++ b/src/wanijo/instance/domain.clj
@@ -0,0 +1,65 @@
+(ns wanijo.instance.domain
+  (:require [wanijo.specs :as specs]
+            [wanijo.attribute.domain :as domain-attr]
+            [wanijo.schema.db :as db-schema]
+            [wanijo.tag.db :as db-tag]
+            [wanijo.link.db :as db-link]
+            [clojure.spec.alpha :as spec]))
+
+(spec/def ::instance
+  (spec/keys :req-un [::specs/uuid
+                      ::specs/created_at
+                      ::specs/updated_at
+                      ::specs/name]))
+(spec/def ::properties
+  (spec/coll-of
+    (spec/keys :req-un [::specs/uuid
+                        ::specs/created_at
+                        ::specs/updated_at
+                        ::domain-attr/attribute])))
+(spec/def ::target ::instance)
+(spec/def ::source ::instance)
+(spec/def ::tags
+  (spec/coll-of ::db-tag/tag))
+(spec/def ::contains-schema
+  (spec/keys :req-un [::db-schema/schema]))
+
+(spec/def ::instances-with-tags
+  (spec/coll-of (spec/merge ::instance
+                            (spec/keys :req-un [::tags]))))
+
+(spec/def ::instance-with-schema
+  (spec/merge ::instance ::contains-schema))
+
+(spec/def ::prop-tuple-values
+  (spec/keys :req-un [::specs/uuid
+                      ::specs/now
+                      ::value
+                      ::specs/instance_uuid
+                      ::specs/attribute_uuid]))
+(spec/def ::prop-tuple
+  (spec/coll-of
+    (spec/tuple fn? ::prop-tuple-values)))
+
+(spec/def ::links-out
+  (spec/coll-of
+    (spec/keys :req-un [::db-link/link
+                        ::target
+                        ::db-schema/schema
+                        ::tags])))
+
+(spec/def ::links-in
+  (spec/coll-of
+    (spec/keys :req-un [::db-link/link
+                        ::source
+                        ::db-schema/schema
+                        ::tags])))
+
+(spec/def ::contains-full-information
+  (spec/keys :req-un [::properties
+                      ::links-out
+                      ::links-in
+                      ::tags]))
+(spec/def ::full-instance
+  (spec/merge ::instance-with-schema
+              ::contains-full-information))
diff --git a/src/wanijo/instance/forms.clj b/src/wanijo/instance/forms.clj
index 2c27a99..d98fc47 100644
--- a/src/wanijo/instance/forms.clj
+++ b/src/wanijo/instance/forms.clj
@@ -1,6 +1,5 @@
 (ns wanijo.instance.forms
-  (:require [wanijo.specs :as specs]
-            [wanijo.instance.db :as domain]))
+  (:require [wanijo.specs :as specs]))
 
 (def form
   {:fields {:name {:label "Name"
diff --git a/src/wanijo/instance/view.clj b/src/wanijo/instance/view.clj
index b88a1dc..7a59d8d 100644
--- a/src/wanijo/instance/view.clj
+++ b/src/wanijo/instance/view.clj
@@ -6,7 +6,6 @@
             [markdown.core :as md]
             [formulare.core :as form]
             [wanijo.tag.view :as view-tag]
-            [wanijo.instance.db :as domain]
             [wanijo.visualisation.viz :as viz]
             [wanijo.infrastructure
              [view :as view]
diff --git a/src/wanijo/tag/routes.clj b/src/wanijo/tag/routes.clj
index 8b83127..64e2733 100644
--- a/src/wanijo/tag/routes.clj
+++ b/src/wanijo/tag/routes.clj
@@ -6,7 +6,7 @@
             [wanijo.schema.db :as domain-schema]
             [wanijo.instance
              [view :as view-instance]
-             [db :as domain-instance]]
+             [db :as db-instance]]
             [wanijo.tag
              [db :as domain]
              [forms :as forms]]))
@@ -22,7 +22,7 @@
         (resp/redirect (path :instance-show
                              {:uuid instance-uuid})))
       (view-instance/show!
-       (domain-instance/full-instance-by-uuid! instance-uuid)
+       (db-instance/full-instance-by-uuid! instance-uuid)
        (domain-schema/accessible-schemas! user-uuid)
        req))))
 
diff --git a/src/wanijo/visualisation/db.clj b/src/wanijo/visualisation/db.clj
index c9848f8..514812c 100644
--- a/src/wanijo/visualisation/db.clj
+++ b/src/wanijo/visualisation/db.clj
@@ -1,7 +1,8 @@
 (ns wanijo.visualisation.db
   (:require [clojure.spec.alpha :as spec]
             [wanijo.infrastructure.neo4j :as neo4j]
-            [wanijo.instance.db :as domain-instance]))
+            [wanijo.instance.db :as db-instance]
+            [wanijo.instance.domain :as domain-instance]))
 
 (spec/def ::link-name
   (spec/or :not-give nil?
@@ -34,7 +35,7 @@
           :links-out
           (fn [links-in]
             (map #(assoc
-                    (domain-instance/full-instance-by-uuid!
+                    (db-instance/full-instance-by-uuid!
                       (-> % :target :uuid))
                     :link-name
                     (-> % :label :name))
@@ -42,9 +43,9 @@
 (defn search! [term]
   {:post [(spec/assert (spec/coll-of ::with-enriched-out-links) %)]}
   (->> (neo4j/exec-query! search {:term (str ".*" term ".*")})
-       (map #(domain-instance/full-instance-by-uuid! (-> % :i :uuid)))
+       (map #(db-instance/full-instance-by-uuid! (-> % :i :uuid)))
        (map enrich-links)))
 
 (defn instance! [uuid]
   {:post [(spec/assert ::with-enriched-out-links %)]}
-  (enrich-links (domain-instance/full-instance-by-uuid! uuid)))
+  (enrich-links (db-instance/full-instance-by-uuid! uuid)))
diff --git a/src/wanijo/visualisation/routes.clj b/src/wanijo/visualisation/routes.clj
index 053fff7..122e72b 100644
--- a/src/wanijo/visualisation/routes.clj
+++ b/src/wanijo/visualisation/routes.clj
@@ -1,10 +1,10 @@
 (ns wanijo.visualisation.routes
   (:require [compojure.core :refer [defroutes wrap-routes
                                     GET POST DELETE]]
-            [ring.util.response :as resp]
-            [wanijo.infrastructure.routing :refer [register! path]]
-            [wanijo.infrastructure.view :as view]
-            [wanijo.instance.db :as domain-instance]
+            [wanijo.infrastructure
+             [routing :refer [register! path]]
+             [view :as view]]
+            [wanijo.instance.db :as db-instance]
             [wanijo.schema.db :as domain-schema]
             [wanijo.visualisation
              [db :as vis-db]
@@ -35,7 +35,7 @@
 (defroutes routes
   (GET (register! :vis-explore "/vis/explore/:instance-uuid")
        [instance-uuid :as req]
-       (vis-view/index (domain-instance/find-by-uuid! instance-uuid)
+       (vis-view/index (db-instance/find-by-uuid! instance-uuid)
                        req))
   (GET (register! :vis-all-instances "/vis/all-instances")
        [:as req]