diff --git a/sbol_factory/sbol_factory.py b/sbol_factory/sbol_factory.py
index f99cbfc..05db052 100644
--- a/sbol_factory/sbol_factory.py
+++ b/sbol_factory/sbol_factory.py
@@ -161,9 +161,14 @@ def __init__(self, *args, **kwargs):
                         # print(kw, val, type(self.__dict__[kw]))
                         # raise
 
+        def accept(self, visitor):
+            visitor_method = f'visit_{CLASS_NAME}'.lower()
+            getattr(visitor, visitor_method)(self)
+
         # Instantiate metaclass
         attribute_dict = {}
         attribute_dict['__init__'] = __init__
+        attribute_dict['accept'] = accept
         Class = type(CLASS_NAME, (globals()[SUPERCLASS_NAME],), attribute_dict)
         globals()[CLASS_NAME] = Class
         self.symbol_table[CLASS_NAME] = Class
diff --git a/setup.py b/setup.py
index 1b4ab34..29b49d0 100644
--- a/setup.py
+++ b/setup.py
@@ -6,9 +6,9 @@
 
 setup(name='sbol_factory',
       description='Ontology-driven data modeling',
-      version='1.0a3',
+      version='1.0a4',
       install_requires=[
-            'sbol3==1.0a8',
+            'sbol3==1.0a9',
             'rdflib>=5.0.0',
             'rdflib-jsonld>=0.5.0',
             'sparqlwrapper>=1.8.5',