diff --git a/src/ol/format/iformat.js b/src/ol/format/iformat.js
new file mode 100644
index 0000000000..3ee5601845
--- /dev/null
+++ b/src/ol/format/iformat.js
@@ -0,0 +1,34 @@
+// FIXME add XML
+// FIXME add IWriter
+
+goog.provide('ol.format.IReader');
+
+
+
+/**
+ * @interface
+ */
+ol.format.IReader = function() {
+};
+
+
+/**
+ * @param {Object} object Object.
+ * @param {function(this: S, ol.Feature): T} callback Callback.
+ * @param {S=} opt_obj Scope.
+ * @return {T|undefined} Callback result.
+ * @template S,T
+ */
+ol.format.IReader.prototype.readObject = function(object, callback, opt_obj) {
+};
+
+
+/**
+ * @param {string} string String.
+ * @param {function(this: S, ol.Feature): T} callback Callback.
+ * @param {S=} opt_obj Scope.
+ * @return {T|undefined} Callback result.
+ * @template S,T
+ */
+ol.format.IReader.prototype.readString = function(string, callback, opt_obj) {
+};