diff --git a/src/ifcopenshell-python/ifcopenshell/entity_instance.py b/src/ifcopenshell-python/ifcopenshell/entity_instance.py
index a9d5b81a06..9f1434717d 100644
--- a/src/ifcopenshell-python/ifcopenshell/entity_instance.py
+++ b/src/ifcopenshell-python/ifcopenshell/entity_instance.py
@@ -54,7 +54,7 @@ _method_dict = {}
 for nm in ifcopenshell_wrapper.schema_names():
     schema = ifcopenshell_wrapper.schema_by_name(nm)
     for decl in schema.declarations():
-        if isinstance(decl, ifcopenshell_wrapper.entity):
+        if hasattr(decl, "argument_types"):
             fq_name = ".".join((nm, decl.name()))
             
             # get type strings as reported by IfcOpenShell C++
diff --git a/src/ifcwrap/IfcParseWrapper.i b/src/ifcwrap/IfcParseWrapper.i
index 51a3badb3d..c63b931c7e 100644
--- a/src/ifcwrap/IfcParseWrapper.i
+++ b/src/ifcwrap/IfcParseWrapper.i
@@ -610,6 +610,16 @@ static IfcUtil::ArgumentType helper_fn_attribute_type(const IfcUtil::IfcBaseClas
 		def __repr__(self):
 			return "<type %s: %r>" % (self.name(), self.declared_type())
 	%}
+	std::vector<std::string> argument_types() {
+		std::vector<std::string> r;
+		auto at = IfcUtil::Argument_UNKNOWN;
+		auto pt = $self->declared_type();
+		if (pt) {
+			at = IfcUtil::from_parameter_type(pt);
+		}
+		r.push_back(IfcUtil::ArgumentTypeToString(at));
+		return r;
+	}
 }
 
 %extend IfcParse::select_type {
@@ -624,6 +634,11 @@ static IfcUtil::ArgumentType helper_fn_attribute_type(const IfcUtil::IfcBaseClas
 		def __repr__(self):
 			return "<enumeration %s: (%s)>" % (self.name(), ", ".join(self.enumeration_items()))
 	%}
+	std::vector<std::string> argument_types() {
+		std::vector<std::string> r;
+		r.push_back(IfcUtil::ArgumentTypeToString(IfcUtil::Argument_STRING));
+		return r;
+	}
 }
 
 %extend IfcParse::attribute {