tests/namespace_test/namespace_test1.fbs - third_party/flatbuffers - Git at Google

 namespace NamespaceA.NamespaceB;

 table TableInNestedNS
 {
     foo:int;
 }

 union UnionInNestedNS {
     TableInNestedNS,
 }

 enum EnumInNestedNS:byte
 {
 	A, B, C
 }

 struct StructInNestedNS
 {
     a:int;
 	b:int;
 }
	namespace NamespaceA.NamespaceB;

	table TableInNestedNS
	{
	foo:int;
	}

	union UnionInNestedNS {
	TableInNestedNS,
	}

	enum EnumInNestedNS:byte
	{
	A, B, C
	}

	struct StructInNestedNS
	{
	a:int;
	b:int;
	}