diff --git a/gxml/DocumentType.vala b/gxml/DocumentType.vala
new file mode 100644
index 0000000000000000000000000000000000000000..fd0fa11229e684e6f5fac98c335e2bf04b3427dd
--- /dev/null
+++ b/gxml/DocumentType.vala
@@ -0,0 +1,28 @@
+/* -*- Mode: vala; indent-tabs-mode: nil; c-basic-offset: 0; tab-width: 2 -*- */
+/* ObjectModel.vala
+ *
+ * Copyright (C) 2015  Daniel Espinosa <esodan@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *      Daniel Espinosa <esodan@gmail.com>
+ */
+
+using Gee;
+
+/**
+ * Interface to represent Document type definitions.
+ */
+public interface GXml.DocumentType : Object, GXml.Node {}
diff --git a/gxml/Makefile.am b/gxml/Makefile.am
index 8bd10213e166010d073d3ed0be6d918498efd987..79008b19ff30e8457a39a87e5f23f96a735b7431 100644
--- a/gxml/Makefile.am
+++ b/gxml/Makefile.am
@@ -17,6 +17,7 @@ sources = \
 	Comment.vala\
 	CDATA.vala \
 	Document.vala \
+	DocumentType.vala \
 	Element.vala \
 	Namespace.vala \
 	Node.vala \
diff --git a/gxml/libxml-DocumentType.vala b/gxml/libxml-DocumentType.vala
index 909620b6f90d6b5b285fb3d86bb95327e1abbf8f..4d9afc660317c20a1e959da9d8f4bc1385cd7685 100644
--- a/gxml/libxml-DocumentType.vala
+++ b/gxml/libxml-DocumentType.vala
@@ -29,7 +29,7 @@ namespace GXml {
 	 * 
 	 * For more, see: [[http://www.w3.org/TR/DOM-Level-1/level-one-core.html#ID-412266927]]
 	 */
-	public class xDocumentType : xNode {
+	public class xDocumentType : xNode, GXml.DocumentType {
 		private Xml.Doc* doc;
 		private Xml.Dtd *int_subset;
 		private Xml.Dtd *ext_subset;