diff --git a/wsme/tests/protocol.py b/wsme/tests/protocol.py
index 33deb24..5157341 100644
--- a/wsme/tests/protocol.py
+++ b/wsme/tests/protocol.py
@@ -249,8 +249,8 @@ class ProtocolTestCase(unittest.TestCase):
         assert r == binarysample or r == base64.encodestring(binarysample), r
 
     def test_return_nested(self):
-        r = self.call('returntypes/getnested')
-        assert r == {'inner': {'aint': 0}} or r == {'inner': {'aint': '0'}}, r
+        r = self.call('returntypes/getnested', _rt=NestedOuter)
+        assert r == {'inner': {'aint': 0}}, r
 
     def test_setstr(self):
         assert self.call('argtypes/setstr', value='astring') == 'astring'
@@ -260,7 +260,7 @@ class ProtocolTestCase(unittest.TestCase):
                         _rt=unicode) == u'の'
 
     def test_setint(self):
-        r = self.call('argtypes/setint', value=3)
+        r = self.call('argtypes/setint', value=3, _rt=int)
         assert r == 3, r
 
     def test_setfloat(self):
diff --git a/wsme/tests/test_restxml.py b/wsme/tests/test_restxml.py
index 84c87b2..80b0845 100644
--- a/wsme/tests/test_restxml.py
+++ b/wsme/tests/test_restxml.py
@@ -1,7 +1,9 @@
 import decimal
 import datetime
+import base64
 
 import wsme.tests.protocol
+from wsme.utils import *
 
 try:
     import xml.etree.ElementTree as et
@@ -11,34 +13,59 @@ except:
 import wsme.restxml
 
 
-def dumpxml(key, obj):
+def dumpxml(key, obj, datatype=None):
     el = et.Element(key)
-    if isinstance(obj, basestring):
+    if isinstance(obj, tuple):
+        obj, datatype = obj
+    if datatype == wsme.types.binary:
+        el.text = base64.encodestring(obj)
+    elif isinstance(obj, basestring):
         el.text = obj
     elif type(obj) in (int, float, decimal.Decimal):
         el.text = str(obj)
     elif type(obj) in (datetime.date, datetime.time, datetime.datetime):
         el.text = obj.isoformat()
+    elif hasattr(datatype, '_wsme_attributes'):
+        for name, attr in datatype._wsme_attributes:
+            if name not in obj:
+                continue
+            o = obj[name]
+            el.append(dumpxml(name, o, attr.datatype))
     elif type(obj) == dict:
-        for key, obj in obj.items():
-            el.append(dumpxml(key, obj))
+        for name, value in obj.items():
+            el.append(dumpxml(name, value))
     return el
 
 
-def loadxml(el):
+def loadxml(el, datatype):
+    print el, datatype, len(el)
     if len(el):
         d = {}
-        for child in el:
-            d[child.tag] = loadxml(child)
+        for name, attr in datatype._wsme_attributes:
+            child = el.find(name)
+            print name, attr, child
+            if child is not None:
+                d[name] = loadxml(child, attr.datatype)
+        print d
         return d
     else:
-        return el.text
+        if datatype == datetime.date:
+            return parse_isodate(el.text)
+        if datatype == datetime.time:
+            return parse_isotime(el.text)
+        if datatype == datetime.datetime:
+            return parse_isodatetime(el.text)
+        if datatype == wsme.types.binary:
+            return base64.decodestring(el.text)
+        if datatype is None:
+            return el.text
+        return datatype(el.text)
 
 
 class TestRestXML(wsme.tests.protocol.ProtocolTestCase):
     protocol = 'REST+XML'
 
-    def call(self, fpath, **kw):
+    def call(self, fpath, _rt=None, **kw):
         el = dumpxml('parameters', kw)
         content = et.tostring(el)
         res = self.app.post(
@@ -58,4 +85,4 @@ class TestRestXML(wsme.tests.protocol.ProtocolTestCase):
                         el.find('debuginfo').text or None)
 
         else:
-            return loadxml(et.fromstring(res.body))
+            return loadxml(et.fromstring(res.body), _rt)