diff --git a/wsme/exc.py b/wsme/exc.py
index 54e22f5..b3529ff 100644
--- a/wsme/exc.py
+++ b/wsme/exc.py
@@ -22,6 +22,18 @@ class InvalidInput(ClientSideError):
         return unicode(self).encode('utf8', 'ignore')
 
 
+class MissingArgument(ClientSideError):
+    def __init__(self, argname, msg=''):
+        self.argname = argname
+        self.msg = msg
+
+    def __unicode__(self):
+        return _(u"Missing argument: %s. %s") % (self.argname, self.msg)
+
+    def __str__(self):
+        return unicode(self).encode('utf8', 'ignore')
+
+
 class UnknownFunction(ClientSideError):
     def __init__(self, name):
         self.name = name
diff --git a/wsme/restjson.py b/wsme/restjson.py
index 35ccb31..68dac20 100644
--- a/wsme/restjson.py
+++ b/wsme/restjson.py
@@ -49,13 +49,57 @@ def datetime_tojson(datatype, value):
     return base64.encodestring(value)
 
 
+@generic
+def fromjson(datatype, value):
+    if value is None:
+        return None
+    if wsme.types.isstructured(datatype):
+        obj = datatype()
+        for name, attrdef in wsme.types.list_attributes(datatype):
+            if name in value:
+                setattr(obj, name, fromjson(attrdef.datatype, value[name]))
+        return obj
+    return value
+
+
+@fromjson.when_object(decimal.Decimal)
+def decimal_fromjson(datatype, value):
+    return decimal.Decimal(value)
+
+
+@fromjson.when_object(datetime.date)
+def date_fromjson(datatype, value):
+    return datetime.datetime.strptime(value, '%Y-%m-%d').date()
+
+
+@fromjson.when_object(datetime.time)
+def time_fromjson(datatype, value):
+    return datetime.datetime.strptime(value, '%H:%M:%S').time()
+
+
+@fromjson.when_object(datetime.datetime)
+def time_fromjson(datatype, value):
+    return datetime.datetime.strptime(value, '%Y-%m-%dT%H:%M:%S')
+
+
+@fromjson.when_object(wsme.types.binary)
+def binary_fromjson(datatype, value):
+    return base64.decodestring(value)
+
+
 class RestJsonProtocol(RestProtocol):
     name = 'REST+Json'
     dataformat = 'json'
     content_types = ['application/json', 'text/json', None]
 
     def decode_args(self, req, arguments):
-        kw = json.loads(req.body)
+        raw_args = json.loads(req.body)
+        kw = {}
+        for farg in arguments:
+            if farg.mandatory and farg.name not in raw_args:
+                raise MissingArgument(farg.name)
+            value = raw_args[farg.name]
+            kw[farg.name] = fromjson(farg.datatype, value)
         return kw
 
     def encode_result(self, result, return_type):
diff --git a/wsme/restxml.py b/wsme/restxml.py
index 2bb1448..1b8ae41 100644
--- a/wsme/restxml.py
+++ b/wsme/restxml.py
@@ -12,6 +12,10 @@ from wsme.rest import RestProtocol
 from wsme.controller import register_protocol
 import wsme.types
 
+import re
+
+time_re = re.compile(r'(?P<h>[0-2][0-9]):(?P<m>[0-5][0-9]):(?P<s>[0-6][0-9])')
+
 
 @generic
 def toxml(datatype, key, value):
@@ -27,6 +31,30 @@ def toxml(datatype, key, value):
     return el
 
 
+@generic
+def fromxml(datatype, element):
+    if element.get('nil', False):
+        return None
+    if wsme.types.isstructured(datatype):
+        obj = datatype()
+        for key, attrdef in datatype._wsme_attributes:
+            sub = element.find(key)
+            if sub is not None:
+                setattr(obj, key, fromxml(attrdef.datatype, sub))
+        return obj
+    return datatype(element.text)
+
+
+@toxml.when_object(bool)
+def bool_toxml(datatype, key, value):
+    el = et.Element(key)
+    if value is None:
+        el.set('nil', 'true')
+    else:
+        el.text = value and 'true' or 'false'
+    return el
+
+
 @toxml.when_object(datetime.date)
 def date_toxml(datatype, key, value):
     el = et.Element(key)
@@ -57,6 +85,31 @@ def binary_toxml(datatype, key, value):
     return el
 
 
+@fromxml.when_object(datetime.date)
+def date_fromxml(datatype, element):
+    return datetime.datetime.strptime(element.text, '%Y-%m-%d').date()
+
+
+@fromxml.when_object(datetime.time)
+def time_fromxml(datatype, element):
+    m = time_re.match(element.text)
+    if m:
+        return datetime.time(
+            int(m.group('h')),
+            int(m.group('m')),
+            int(m.group('s')))
+
+
+@fromxml.when_object(datetime.datetime)
+def datetime_fromxml(datatype, element):
+    return datetime.datetime.strptime(element.text, '%Y-%m-%dT%H:%M:%S')
+
+
+@fromxml.when_object(wsme.types.binary)
+def binary_fromxml(datatype, element):
+    return base64.decodestring(element.text)
+
+
 class RestXmlProtocol(RestProtocol):
     name = 'REST+XML'
     dataformat = 'xml'
@@ -66,6 +119,12 @@ class RestXmlProtocol(RestProtocol):
         el = et.fromstring(req.body)
         assert el.tag == 'parameters'
         kw = {}
+        for farg in arguments:
+            sub = el.find(farg.name)
+            if farg.mandatory and sub is None:
+                raise MissingArgument(farg.name)
+            if sub is not None:
+                kw[farg.name] = fromxml(farg.datatype, sub)
         return kw
 
     def encode_result(self, result, return_type):
diff --git a/wsme/tests/protocol.py b/wsme/tests/protocol.py
index fb01fde..42178ee 100644
--- a/wsme/tests/protocol.py
+++ b/wsme/tests/protocol.py
@@ -85,6 +85,85 @@ class ReturnTypes(object):
         return n
 
 
+class ArgTypes(object):
+    @expose(str)
+    @validate(str)
+    def setstr(self, value):
+        print repr(value)
+        assert type(value) == str
+        return value
+
+    @expose(unicode)
+    @validate(unicode)
+    def setunicode(self, value):
+        print repr(value)
+        assert type(value) == unicode
+        return value
+
+    @expose(bool)
+    @validate(bool)
+    def setbool(self, value):
+        print repr(value)
+        assert type(value) == bool
+        return value
+    
+    @expose(int)
+    @validate(int)
+    def setint(self, value):
+        print repr(value)
+        assert type(value) == int
+        return value
+
+    @expose(float)
+    @validate(float)
+    def setfloat(self, value):
+        print repr(value)
+        assert type(value) == float
+        return value
+
+    @expose(decimal.Decimal)
+    @validate(decimal.Decimal)
+    def setdecimal(self, value):
+        print repr(value)
+        assert type(value) == decimal.Decimal
+        return value
+
+    @expose(datetime.date)
+    @validate(datetime.date)
+    def setdate(self, value):
+        print repr(value)
+        assert type(value) == datetime.date
+        return value
+
+    @expose(datetime.time)
+    @validate(datetime.time)
+    def settime(self, value):
+        print repr(value)
+        assert type(value) == datetime.time
+        return value
+
+    @expose(datetime.datetime)
+    @validate(datetime.datetime)
+    def setdatetime(self, value):
+        print repr(value)
+        assert type(value) == datetime.datetime
+        return value
+
+    @expose(wsme.types.binary)
+    @validate(wsme.types.binary)
+    def setbinary(self, value):
+        print repr(value)
+        assert type(value) == str
+        return value
+
+    @expose(NestedOuter)
+    @validate(NestedOuter)
+    def setnested(self, value):
+        print repr(value)
+        assert type(value) == NestedOuter
+        return value
+
+
 class WithErrors(object):
     @expose()
     def divide_by_zero(self):
@@ -92,6 +171,7 @@ class WithErrors(object):
 
 
 class WSTestRoot(WSRoot):
+    argtypes = ArgTypes()
     returntypes = ReturnTypes()
     witherrors = WithErrors()
 
@@ -167,10 +247,46 @@ class ProtocolTestCase(unittest.TestCase):
         r = self.call('returntypes/getbinary')
         assert r == binarysample or r == base64.encodestring(binarysample), r
 
-    def test_return_binary(self):
-        r = self.call('returntypes/getbinary')
-        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
+
+    def test_setstr(self):
+        assert self.call('argtypes/setstr', value='astring') in ('astring',)
+
+    def test_setunicode(self):
+        assert self.call('argtypes/setunicode', value=u'の') in (u'の',)
+
+    def test_setint(self):
+        assert self.call('argtypes/setint', value=3) in (3, '3')
+
+    def test_setfloat(self):
+        return self.call('argtypes/setfloat', value=3.54) in (3.54, '3.54')
+
+    def test_setdecimal(self):
+        return self.call('argtypes/setdecimal', value='3.14') in ('3.14', decimal.Decimal('3.14'))
+
+    def test_setdate(self):
+        return self.call('argtypes/setdate', value='2008-04-06') in (
+                datetime.date(2008, 4, 6), '2008-04-06')
+
+    def test_settime(self):
+        return self.call('argtypes/settime', value='12:12:15') \
+                in ('12:12:15', datetime.time(12, 12, 15))
+
+    def test_setdatetime(self):
+        return self.call('argtypes/setdatetime', value='2008-04-06T12:12:15') \
+                in ('2008-04-06T12:12:15',
+                    datetime.datetime(2008, 4, 6, 12, 12, 15))
+
+    def test_setbinary(self):
+        r = self.call('argtypes/setbinary',
+                value=base64.encodestring(binarysample))
+        assert r == binarysample or r == base64.encodestring(binarysample), r
+
+    def test_setnested(self):
+        return self.call('argtypes/setnested',
+            value={'inner': {'aint': 54}}) in (
+                {'inner': {'aint': 54}},
+                {'inner': {'aint': '54'}}
+            )
diff --git a/wsme/tests/test_restxml.py b/wsme/tests/test_restxml.py
index 7125a65..84c87b2 100644
--- a/wsme/tests/test_restxml.py
+++ b/wsme/tests/test_restxml.py
@@ -14,14 +14,14 @@ import wsme.restxml
 def dumpxml(key, obj):
     el = et.Element(key)
     if isinstance(obj, basestring):
-        el(obj)
+        el.text = obj
     elif type(obj) in (int, float, decimal.Decimal):
-        el(str(obj))
+        el.text = str(obj)
     elif type(obj) in (datetime.date, datetime.time, datetime.datetime):
-        el(obj.isoformat())
+        el.text = obj.isoformat()
     elif type(obj) == dict:
         for key, obj in obj.items():
-            e.append(dumpxml(key, obj))
+            el.append(dumpxml(key, obj))
     return el
 
 
@@ -35,7 +35,7 @@ def loadxml(el):
         return el.text
 
 
-class TestRestJson(wsme.tests.protocol.ProtocolTestCase):
+class TestRestXML(wsme.tests.protocol.ProtocolTestCase):
     protocol = 'REST+XML'
 
     def call(self, fpath, **kw):