Index: boost/property_tree/detail/xml_parser_write.hpp
===================================================================
--- boost/property_tree/detail/xml_parser_write.hpp	(revision 66409)
+++ boost/property_tree/detail/xml_parser_write.hpp	(working copy)
@@ -88,6 +88,8 @@
                 }
             }
         }
+
+
         
         // Write element
         if (pt.data().empty() && pt.empty())    // Empty key
@@ -116,8 +118,12 @@
                 if (optional<const Ptree &> attribs = pt.get_child_optional(xmlattr<Ch>()))
                     for (It it = attribs.get().begin(); it != attribs.get().end(); ++it)
                         stream << Ch(' ') << it->first << Ch('=') << 
-                                  Ch('"') << it->second.template get_value<std::basic_string<Ch> >() << Ch('"');
+                                  Ch('"') << encode_char_entities(
+                                                                   it->second.template get_value<std::basic_string<Ch> >()
+                                  )  << Ch('"');
 
+
+
                 if ( has_attrs_only )
                 {
                     // Write closing brace