diff --git a/snark-document-builder/src/main/kotlin/Build.kt b/snark-document-builder/src/main/kotlin/Build.kt
new file mode 100644
index 0000000..c15b225
--- /dev/null
+++ b/snark-document-builder/src/main/kotlin/Build.kt
@@ -0,0 +1,17 @@
+package documentBuilder
+
+internal class GraphManager(private val graph: DependencyGraph) {
+    fun buildDocument(file: FileName) {
+        val list = graph.nodes[file]
+        if (list != null) {
+            for (element in list.dependencies) {
+                element.visit(this)
+            }
+        }
+    }
+
+    fun getAstRootDocument(file: FileName): MdAstRoot {
+        buildDocument(file)
+        return graph.nodes[file]!!.mdAst
+    }
+}
diff --git a/snark-document-builder/src/main/kotlin/DependencyGraph.kt b/snark-document-builder/src/main/kotlin/DependencyGraph.kt
index dc0a8bc..864838a 100644
--- a/snark-document-builder/src/main/kotlin/DependencyGraph.kt
+++ b/snark-document-builder/src/main/kotlin/DependencyGraph.kt
@@ -1,5 +1,7 @@
 package documentBuilder
 
+import kotlinx.coroutines.coroutineScope
+
 public typealias FileName = String
 
 /**
@@ -19,6 +21,7 @@ public data class DependencyGraphNode(
  * Interface of all dependency edges.
  */
 public sealed interface DependencyGraphEdge {
+    public fun visit(graphManager: GraphManager)
 }
 
 /**
@@ -32,7 +35,16 @@ public data class IncludeDependency(
     val parentNode: MdAstParent,
     val dependentNode: MdAstElement,
     val includeList: List<FileName>
-) : DependencyGraphEdge
+) : DependencyGraphEdge {
+    override fun visit(graphManager: GraphManager) {
+        val parent = parentNode
+        for (file in includeList) {
+            graphManager.buildDocument(file)
+            parent.children.add(graphManager.graph.nodes[file].mdAst)
+        }
+        dependentNode = parent
+    }
+}
 
 /**
  * Whole dependency graph.