diff --git a/CHANGES.txt b/CHANGES.txt
index 68a2561..0d690d7 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -4,7 +4,9 @@ CHANGELOG
 0.12.22 (unreleased)
 --------------------
 
-- Nothing changed yet.
+- proper usage of config property inside objects. [Davorin Kunstelj]
+- dump user defined types with handler functions (can be used to override dump
+  of built-in types). [Davorin Kunstelj]
 
 
 0.12.21 (2014-05-27)
diff --git a/src/SOAPpy/Config.py b/src/SOAPpy/Config.py
index 24440a8..9f5e043 100644
--- a/src/SOAPpy/Config.py
+++ b/src/SOAPpy/Config.py
@@ -116,6 +116,13 @@ class SOAPConfig:
             # authorization error.
             self.authMethod = None
 
+            # The tuple of type and dump handler function pairs for
+            # SOAPBuilder dump dispatch. Used for handling additional types
+            # and overriding built-in types. Functions are expected to have
+            # the same parameters as SOAPBuilder dump_<type> methods
+            # (including self; possibility to call any SOAPBuilder dump method)
+            self.dumpmap = tuple()
+
             # Globus Support if pyGlobus.io available
             try:
                 from pyGlobus import io;
@@ -144,6 +151,12 @@ class SOAPConfig:
             if d['SSLclient'] or d['SSLserver']:
                 d['SSL'] = self.SSLconfig()
 
+        dumpmap = kw.pop("dumpmap", None)
+        if dumpmap:
+            if not isinstance(dumpmap, tuple):
+                raise TypeError("Config dumpmap parameter must be a tuple")
+            self.dumpmap = dumpmap + self.dumpmap
+
         for k, v in kw.items():
             if k[0] != '_':
                 setattr(self, k, v)
diff --git a/src/SOAPpy/SOAPBuilder.py b/src/SOAPpy/SOAPBuilder.py
index cfbd5aa..0ce204b 100644
--- a/src/SOAPpy/SOAPBuilder.py
+++ b/src/SOAPpy/SOAPBuilder.py
@@ -596,6 +596,12 @@ class SOAPBuilder:
             else:
                 tag = self.gentag()
 
+        # Apply additional types, override built-in types
+        for dtype, func in self.config.dumpmap:
+            if isinstance(obj, dtype):
+                func(self, obj, tag, typed, ns_map)
+                return
+
         # watch out for order!
         dumpmap = (
             (Exception, self.dump_exception),