diff --git a/pyxnat/core/interfaces.py b/pyxnat/core/interfaces.py
index 3ad9f967..5bcfa545 100644
--- a/pyxnat/core/interfaces.py
+++ b/pyxnat/core/interfaces.py
@@ -4,11 +4,6 @@
 import json
 import requests
 
-try:
-    import socks
-except ImportError:
-    socks = None
-
 from urllib.parse import urlparse
 
 from .select import Select
@@ -21,11 +16,38 @@
 from .array import ArrayData
 from .xpath_store import XpathStore
 from . import xpass
+from . import derivatives
+
 
 DEBUG = False
 STUBBORN = False
 
 
+# generic classes
+def __get_modules__(m):
+    import pkgutil
+    modules = []
+    prefix = m.__name__ + '.'
+    for importer, modname, ispkg in pkgutil.iter_modules(m.__path__, prefix):
+        module = __import__(modname, fromlist='dummy')
+        if not ispkg:
+            modules.append(module)
+        else:
+            modules.extend(__get_modules__(module))
+    return modules
+
+
+def __find_all_functions__(m):
+    import inspect
+    functions = {}
+    modules = __get_modules__(m)
+    for m in modules:
+        for name, obj in inspect.getmembers(m):
+            if inspect.isfunction(obj):
+                functions.setdefault(m, []).append(obj)
+    return functions
+
+
 # main entry point
 class Interface(object):
     """ Main entry point to access an XNAT server.
@@ -174,6 +196,16 @@ def __init__(self, server=None, user=None, password=None, config=None,
         self.manage = GlobalManager(self)
         self.xpath = XpathStore(self)
 
+        functions = __find_all_functions__(derivatives)
+        d = {}
+        for m, mod_functions in functions.items():
+            if hasattr(m, 'XNAT_RESOURCE_NAME'):
+                d[m.XNAT_RESOURCE_NAME] = mod_functions
+            elif hasattr(m, 'XNAT_RESOURCE_NAMES'):
+                for each in m.XNAT_RESOURCE_NAMES:
+                    d[each] = mod_functions
+        self._mod_functions = d
+
         if _DRAW_GRAPHS:
             self._get_graph = GraphData(self)
             self.draw = PaintGraph(self)
diff --git a/pyxnat/core/resources.py b/pyxnat/core/resources.py
index 82237cb0..4d1f175f 100644
--- a/pyxnat/core/resources.py
+++ b/pyxnat/core/resources.py
@@ -30,10 +30,7 @@
 from . import schema
 from . import httputil
 from . import downloadutils
-from . import derivatives
 import types
-import pkgutil
-import inspect
 from urllib.parse import quote, unquote
 
 DEBUG = False
@@ -121,29 +118,6 @@ def __init__(cls, name, bases, dct):
         super(CollectionType, cls).__init__(name, bases, dct)
 
 
-# generic classes
-def __get_modules__(m):
-    modules = []
-    prefix = m.__name__ + '.'
-    for importer, modname, ispkg in pkgutil.iter_modules(m.__path__, prefix):
-        module = __import__(modname, fromlist='dummy')
-        if not ispkg:
-            modules.append(module)
-        else:
-            modules.extend(__get_modules__(module))
-    return modules
-
-
-def __find_all_functions__(m):
-    functions = {}
-    modules = __get_modules__(m)
-    for m in modules:
-        for name, obj in inspect.getmembers(m):
-            if inspect.isfunction(obj):
-                functions.setdefault(m, []).append(obj)
-    return functions
-
-
 class EObject(object):
     """ Generic Object for an element URI.
     """
@@ -165,20 +139,6 @@ def __init__(self, uri, interface):
         self._intf = interface
         self.attrs = EAttrs(self)
 
-        functions = __find_all_functions__(derivatives)
-
-        for m, mod_functions in functions.items():
-            is_resource = False
-            if (hasattr(m, 'XNAT_RESOURCE_NAME') and
-                    self._urn == m.XNAT_RESOURCE_NAME) or \
-                    (hasattr(m, 'XNAT_RESOURCE_NAMES') and
-                        self._urn in m.XNAT_RESOURCE_NAMES):
-                is_resource = True
-
-            if is_resource:
-                for f in mod_functions:
-                    setattr(self, f.__name__, types.MethodType(f, self))
-
     def __getstate__(self):
         return {'uri': self._uri,
                 'interface': self._intf}
@@ -1793,14 +1753,12 @@ def __repr__(self):
             return output
         else:
             return '<%s Object> %s' % (self.__class__.__name__,
-                                       unquote(uri_last(self._uri))
-                                       )
+                                       unquote(uri_last(self._uri)))
 
     def set_param(self, key, value):
         self.attrs.set('%s/parameters/addParam[name=%s]/addField'
                        % (self.datatype(), key),
-                       value
-                       )
+                       value)
 
     def get_param(self, key):
         return self.xpath(
@@ -1815,6 +1773,25 @@ def params(self):
 
 class Resource(EObject, metaclass=ElementType):
 
+    def __init__(self, cbase, interface):
+        from pyxnat.core.errors import DatabaseError
+        super(Resource, self).__init__(cbase, interface)
+
+        mf = interface._mod_functions.get(self._urn, [])
+        if len(mf) == 0:
+            uri = uri_parent(self._uri)
+            try:
+                d = self._intf._get_json(uri)
+                r = [e for e in d if e['xnat_abstractresource_id'] == self._urn]
+                if len(r) == 1:
+                    label = r[0]['label']
+                    mf = interface._mod_functions.get(label, [])
+            except DatabaseError:
+                print('Warning:', self._uri, 'raising DatabaseError')
+
+        for f in mf:
+            setattr(self, f.__name__, types.MethodType(f, self))
+
     def __repr__(self):
 
         def sizeof_fmt(num, suffix='B'):