diff --git a/src/ifcparse/IfcLateBoundEntity.cpp b/src/ifcparse/IfcLateBoundEntity.cpp
index 8fc6d550cf..78d63e1f0f 100644
--- a/src/ifcparse/IfcLateBoundEntity.cpp
+++ b/src/ifcparse/IfcLateBoundEntity.cpp
@@ -95,6 +95,10 @@ Argument* IfcParse::IfcLateBoundEntity::getArgument(unsigned int i) const {
 const char* IfcParse::IfcLateBoundEntity::getArgumentName(unsigned int i) const {
 	return IfcSchema::Type::GetAttributeName(_type,i).c_str();
 }
+bool IfcParse::IfcLateBoundEntity::getArgumentOptionality(unsigned int i) const {
+	return IfcSchema::Type::GetAttributeOptional(_type, i);
+}
+
 void IfcParse::IfcLateBoundEntity::invalid_argument(unsigned int i, const std::string& t) {
 	const std::string arg_name = IfcSchema::Type::GetAttributeName(_type,i);
 	throw IfcException(t + " is not a valid type for '" + arg_name + "'");
diff --git a/src/ifcparse/IfcLateBoundEntity.h b/src/ifcparse/IfcLateBoundEntity.h
index 5df5480e0f..4cc67833ca 100644
--- a/src/ifcparse/IfcLateBoundEntity.h
+++ b/src/ifcparse/IfcLateBoundEntity.h
@@ -52,6 +52,7 @@ namespace IfcParse {
 		Argument* getArgument(unsigned int i) const;
 		const char* getArgumentName(unsigned int i) const;
 		unsigned getArgumentIndex(const std::string& a) const;
+		bool getArgumentOptionality(unsigned int i) const;
 
 		IfcEntityList::ptr get_inverse(const std::string& a);
 
diff --git a/src/ifcwrap/IfcParseWrapper.i b/src/ifcwrap/IfcParseWrapper.i
index 06eb9e5f52..5a8184c9cb 100644
--- a/src/ifcwrap/IfcParseWrapper.i
+++ b/src/ifcwrap/IfcParseWrapper.i
@@ -56,6 +56,7 @@ namespace IfcUtil {
 %rename("get_argument_type") getArgumentType;
 %rename("get_argument_name") getArgumentName;
 %rename("get_argument_index") getArgumentIndex;
+%rename("get_argument_optionality") getArgumentOptionality;
 %rename("_set_argument") setArgument;
 %rename("__repr__") toString;
 %rename("entity_instance") IfcLateBoundEntity;
@@ -179,6 +180,14 @@ namespace IfcUtil {
 		std::ofstream f(fn.c_str());
 		f << (*$self);
 	}
+	std::vector<int> entity_names() const {
+		std::vector<int> keys;
+		keys.reserve(std::distance($self->begin(), $self->end()));
+		for (IfcParse::IfcFile::entity_by_id_t::const_iterator it = $self->begin(); it != $self->end(); ++ it) {
+			keys.push_back(it->first);
+		}
+		return keys;
+	}
 	%pythoncode %{
 		if _newclass:
 			# Hide the getters with read-only property implementations