diff --git a/project.clj b/project.clj
index 86806dd..9f20be0 100644
--- a/project.clj
+++ b/project.clj
@@ -30,7 +30,8 @@
                  [ring/ring-anti-forgery "1.1.0"]
                  [ring-server "0.4.0"]
                  [selmer "1.11.0"]
-                 [com.stuartsierra/component "0.3.2"]]
+                 [com.stuartsierra/component "0.3.2"]
+                 [prismatic/schema "1.1.9"]]
 
   :repl-options {:init-ns smeagol.repl}
 
diff --git a/src/smeagol/include.clj b/src/smeagol/include.clj
index adc361f..80d9640 100644
--- a/src/smeagol/include.clj
+++ b/src/smeagol/include.clj
@@ -1,11 +1,26 @@
 (ns smeagol.include
   (:require
-    [com.stuartsierra.component :as component]))
+    [schema.core :as s]
+    [com.stuartsierra.component :as component]
+    [smeagol.include.resolver :as resolver]))
 
-(defrecord Resolver [resolver-fn])
+(s/defrecord Includer
+  [resolver])
 
-(defn new-resolver [resolver-fn]
-  (map->Resolver {:resolver-fn resolver-fn}))
+(defprotocol IncludeMd
+  (expand-include-md
+    [includer md-src]
+    "return a markfown file content for given uri."))
 
-(defn resolve-include [resolver uri]
-  (apply (:resolver-fn resolver) [uri]))
+(extend-type Includer
+  IncludeMd
+  (expand-include-md [includer md-src]
+    ;parse md-src
+    ;resolve found includes
+    ;indent & integrate
+    md-src))
+
+(s/defn
+  new-includer
+  []
+  (map->Includer {}))
diff --git a/src/smeagol/include/resolver.clj b/src/smeagol/include/resolver.clj
new file mode 100644
index 0000000..cca0934
--- /dev/null
+++ b/src/smeagol/include/resolver.clj
@@ -0,0 +1,38 @@
+(ns smeagol.include.resolver
+  (:require
+    [schema.core :as s]
+    [com.stuartsierra.component :as component]))
+
+(s/defrecord Resolver
+  [type :- s/Keyword])
+
+;As schema does'nt support s/defprotocol we use the dispatcher for annotation & validation.
+(s/defn dispatch-by-resolver-type :- s/Keyword
+  "Dispatcher for different resolver implementations."
+  [resolver :- Resolver
+   uri :- s/Str]
+  (:type resolver))
+
+(defmulti do-resolve-md
+  "Multimethod return a markfown file content for given uri."
+  dispatch-by-resolver-type)
+(s/defmethod do-resolve-md :default
+  [resolver :- Resolver
+   uri :- s/Str]
+  (throw (Exception. (str "No implementation for " resolver))))
+
+(defprotocol ResolveMd
+  (resolve-md
+    [resolver uri]
+    "return a markfown file content for given uru."))
+
+(extend-type Resolver
+  ResolveMd
+  (resolve-md [resolver uri]
+    (s/validate s/Str uri)
+    (s/validate s/Str (do-resolve-md resolver uri))))
+
+(s/defn
+  new-resolver
+  [type :- s/Keyword]
+  (map->Resolver {:type type}))
diff --git a/test/smeagol/test/include.clj b/test/smeagol/test/include.clj
index 143eb61..749482b 100644
--- a/test/smeagol/test/include.clj
+++ b/test/smeagol/test/include.clj
@@ -1,16 +1,32 @@
 (ns smeagol.test.include
   (:require [clojure.test :refer :all]
+            [schema.core :as s]
             [com.stuartsierra.component :as component]
+            [smeagol.include.resolver :as resolver]
             [smeagol.include :as sut]))
 
-(defn test-include-resolver [uri]
+(s/defmethod resolver/do-resolve-md :test-mock
+  [resolver
+   uri :- s/Str]
   (cond
     (= uri "./simple.md") "Simple content."))
 
 (def system-under-test
   (component/system-map
-    :resolver (sut/new-resolver test-include-resolver)))
+    :resolver (resolver/new-resolver :test-mock)
+    :includer (component/using
+                (sut/new-includer)
+                {:resolver :resolver})))
 
-(deftest test-local-links
+(deftest test-expand-include-md
   (testing "Rewriting of local links"
-    (is (= "Simple content." (sut/resolve-include (:resolver system-under-test) "./simple.md")))))
+    (is
+      (= "# Heading"
+         (sut/expand-include-md (:includer system-under-test) "# Heading")))
+    (is
+      (= "# Heading 1
+          Simple content."
+         (sut/expand-include-md
+           (:includer system-under-test)
+           "# Heading1
+#[](.simple.md)")))))
diff --git a/test/smeagol/test/include/resolver.clj b/test/smeagol/test/include/resolver.clj
new file mode 100644
index 0000000..fd080d9
--- /dev/null
+++ b/test/smeagol/test/include/resolver.clj
@@ -0,0 +1,8 @@
+(ns smeagol.test.include.resolver
+  (:require [clojure.test :refer :all]
+            [smeagol.include.resolver :as sut]))
+
+(deftest test-local-links
+  (testing "Rewriting of local links"
+    (is (thrown? Exception
+          (sut/resolve-md (sut/new-resolver (:default)) "./some-uri.md")))))