--- graphml.cpp	2011-06-10 10:47:04.000000000 +0100
+++ graphml.cpp	2011-06-10 10:47:36.000000000 +0100
@@ -21,6 +21,8 @@
 
 using namespace boost;
 
+namespace {
+
 class graphml_reader
 {
 public:
@@ -202,6 +204,8 @@
     std::vector<any> m_edge;
 };
 
+}
+
 namespace boost
 {
 void BOOST_GRAPH_DECL