diff --git a/.gitignore b/.gitignore
index fac1c5f..e84b3bc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,4 @@ neo4j/*
 resources/public/js/out
 .rebel_readline_history
 /elm-stuff
+*.*~
diff --git a/src/wanijo/instance/domain.clj b/src/wanijo/instance/domain.clj
index d8bf6a6..74da9a1 100644
--- a/src/wanijo/instance/domain.clj
+++ b/src/wanijo/instance/domain.clj
@@ -1,35 +1,24 @@
 (ns wanijo.instance.domain
   (:require [clojure.spec.alpha :as spec]
+            [wanijo.specs :as specs]
             [wanijo.framework.neo4j :as neo4j]
             [wanijo.schema.domain :as domain-schema]
             [wanijo.attribute.domain :as domain-attr]))
 
-(spec/def ::created-at ::neo4j/date-str)
-(spec/def ::created_at ::neo4j/date-str)
-(spec/def ::updated-at ::neo4j/date-str)
-(spec/def ::updated_at ::neo4j/date-str)
-(spec/def ::name string?)
-(spec/def ::value
-  (spec/or :string string?
-           :bool boolean?
-           :nil nil?
-           :number number?))
-(spec/def ::instance_uuid ::neo4j/uuid)
-(spec/def ::attribute_uuid ::neo4j/uuid)
 (spec/def ::instance
   (spec/keys :req-un [::neo4j/uuid
-                      ::created_at
-                      ::updated_at
-                      ::name]))
+                      ::specs/created_at
+                      ::specs/updated_at
+                      ::specs/name]))
 (spec/def ::properties
   (spec/coll-of
    (spec/keys :req-un [::neo4j/uuid
-                       ::created_at
-                       ::updated_at
+                       ::specs/created_at
+                       ::specs/updated_at
                        ::domain-attr/attribute])))
 (spec/def ::link
   (spec/keys :req-un [::neo4j/uuid
-                      ::created_at
+                      ::specs/created_at
                       ::name]))
 (spec/def ::target ::instance)
 (spec/def ::source ::instance)
@@ -46,15 +35,14 @@
 (spec/def ::tags
   (spec/coll-of
    (spec/keys :req-un [::neo4j/uuid
-                       ::name
-                       ::created-at])))
+                       ::specs/name
+                       ::specs/created_at])))
 
 (neo4j/defquery findy-by-schema
   "MATCH (i:instance)-[:of]->(s:schema)
    WHERE s.uuid = {uuid}
    RETURN i
    ORDER BY i.name")
-
 (defn find-by-schema! [schema-uuid]
   (map :i
        (neo4j/exec-query!
@@ -69,7 +57,6 @@
       SET i.name = {name},
           i.created_at = {created_at},
           i.updated_at = {created_at}")
-
 (neo4j/defquery create-property
   "MATCH (i:instance {uuid:{uuid}}),
          (a:attribute {uuid:{attr_uuid}})
@@ -78,7 +65,6 @@
      SET p.value = {value},
          p.created_at = {created_at},
          p.updated_at = {updated_at}")
-
 (defn create! [user-uuid schema-uuid instance]
   (let [instance-uuid (neo4j/uuid)
         now (neo4j/now-str)
@@ -100,16 +86,14 @@
            (concat [instance-tuple]
                    prop-tuples))))
 
-(neo4j/defquery find-by-uuid
-  "MATCH (i:instance {uuid:{uuid}})
-         -[:of]->(s:schema)
-   RETURN i, s")
-
 (spec/def ::instance-with-schema
   (spec/and ::instance
             (spec/keys :req-un
                        [::domain-schema/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 %)]}
   (->> (neo4j/exec-query! find-by-uuid
@@ -125,7 +109,6 @@
          (p)-[:of]->(a:attribute)
    RETURN p, a
     ORDER BY a.name")
-
 (defn find-properties! [uuid]
   (map #(assoc (:p %)
                :attribute
@@ -133,6 +116,15 @@
        (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},
@@ -147,16 +139,6 @@
                  p.value = {value}
    ON MATCH SET p.updated_at = {now},
                 p.value = {value}")
-(spec/def ::now ::neo4j/date-str)
-(spec/def ::prop-tuple-values
-  (spec/keys :req-un [::neo4j/uuid
-                      ::now
-                      ::value
-                      ::instance_uuid
-                      ::attribute_uuid]))
-(spec/def ::prop-tuple
-  (spec/coll-of
-   (spec/tuple fn? ::prop-tuple-values)))
 (defn instance->prop-tuples [instance]
   {:post [(spec/assert ::prop-tuple %)]}
   (map (fn [prop]
@@ -263,9 +245,9 @@
 (spec/def ::full-instance
   (spec/and ::instance-with-schema
             (spec/keys ::req-un [::neo4j/uuid
-                                 ::created-at
-                                 ::updated-at
-                                 ::name
+                                 ::specs/created-at
+                                 ::specs/updated-at
+                                 ::specs/name
                                  ::properties
                                  ::links-out
                                  ::links-in
diff --git a/src/wanijo/specs.clj b/src/wanijo/specs.clj
new file mode 100644
index 0000000..ee39408
--- /dev/null
+++ b/src/wanijo/specs.clj
@@ -0,0 +1,10 @@
+(ns wanijo.specs
+  (:require [clojure.spec.alpha :as spec]
+            [wanijo.framework.neo4j :as neo4j]))
+
+(spec/def ::created_at ::neo4j/date-str)
+(spec/def ::updated_at ::neo4j/date-str)
+(spec/def ::name string?)
+(spec/def ::instance_uuid ::neo4j/uuid)
+(spec/def ::attribute_uuid ::neo4j/uuid)
+(spec/def ::now ::neo4j/date-str)