diff --git a/include/cereal/archives/xml.hpp b/include/cereal/archives/xml.hpp
index 0858e2ad..a227f7b3 100644
--- a/include/cereal/archives/xml.hpp
+++ b/include/cereal/archives/xml.hpp
@@ -76,8 +76,8 @@ namespace cereal
       and instead infer it from the number of children for a node.  This means that data
       can be hand edited for dynamic sized structures and will still be readable.  This
       is accomplished through the cereal::SizeTag object, which will also add an attribute
-      to its parent field. */
-  /*! \ingroup Archives */
+      to its parent field.
+      \ingroup Archives */
   class XMLOutputArchive : public OutputArchive<XMLOutputArchive>
   {
     public:
@@ -212,9 +212,12 @@ namespace cereal
         itsNodes.top().node->append_attribute( itsXML.allocate_attribute( "type", namePtr ) );
       }
 
-      void markDynamicSize()
+      //! Appends an attribute to the current top level node
+      void appendAttribute( const char * name, const char * value )
       {
-        itsNodes.top().node->append_attribute( itsXML.allocate_attribute( "size", "dynamic" ) );
+        auto namePtr =  itsXML.allocate_string( name );
+        auto valuePtr = itsXML.allocate_string( value );
+        itsNodes.top().node->append_attribute( itsXML.allocate_attribute( namePtr, valuePtr ) );
       }
 
     protected:
@@ -259,7 +262,10 @@ namespace cereal
 
   // ######################################################################
   //! An output archive designed to save data to XML
-  /*! \ingroup Archives */
+  /*! This archive uses RapidXML to build an in memory XML tree of the
+      data in the stream it is given before loading any types serialized.
+
+      \ingroup Archives */
   class XMLInputArchive : public InputArchive<XMLInputArchive>
   {
     public:
@@ -497,7 +503,7 @@ namespace cereal
   template <class T>
   void prologue( XMLOutputArchive & ar, SizeTag<T> const & )
   {
-    ar.markDynamicSize();
+    ar.appendAttribute( "size", "dynamic" );
   }
 
   template <class T>
diff --git a/include/cereal/types/array.hpp b/include/cereal/types/array.hpp
index dfc1759e..3fc9766e 100644
--- a/include/cereal/types/array.hpp
+++ b/include/cereal/types/array.hpp
@@ -55,7 +55,7 @@ namespace cereal
     ar( binary_data( array.data(), N * sizeof(T) ) );
   }
 
-  //! Saving for std::array all other types to binary
+  //! Saving for std::array all other types
   template <class Archive, class T, size_t N> inline
   typename std::enable_if<!traits::is_output_serializable<BinaryData<T>, Archive>()
                           || !std::is_arithmetic<T>::value, void>::type
@@ -65,7 +65,7 @@ namespace cereal
       ar( i );
   }
 
-  //! Loading for std::array all other types to binary
+  //! Loading for std::array all other types
   template <class Archive, class T, size_t N> inline
   typename std::enable_if<!traits::is_input_serializable<BinaryData<T>, Archive>()
                           || !std::is_arithmetic<T>::value, void>::type
diff --git a/include/cereal/types/bitset.hpp b/include/cereal/types/bitset.hpp
index fcc4d60e..3b022c17 100644
--- a/include/cereal/types/bitset.hpp
+++ b/include/cereal/types/bitset.hpp
@@ -37,6 +37,8 @@ namespace cereal
 {
   namespace bitset_detail
   {
+    //! The type the bitset is encoded with
+    /*! @internal */
     enum class type : uint8_t
     {
       ulong,
diff --git a/include/cereal/types/boost_variant.hpp b/include/cereal/types/boost_variant.hpp
index f66561f9..90ead2be 100644
--- a/include/cereal/types/boost_variant.hpp
+++ b/include/cereal/types/boost_variant.hpp
@@ -38,6 +38,7 @@ namespace cereal
 {
   namespace binary_detail
   {
+    //! @internal
     template <class Archive>
     struct variant_save_visitor : boost::static_visitor<>
     {
@@ -52,6 +53,7 @@ namespace cereal
       Archive & ar;
     };
 
+    //! @internal
     template<int N, class Variant, class ... Args, class Archive>
     typename std::enable_if<N == boost::mpl::size<typename Variant::types>::value, void>::type
     load_variant(Archive & ar, int target, Variant & variant)
@@ -59,6 +61,7 @@ namespace cereal
       throw ::cereal::Exception("Error traversing variant during load");
     }
 
+    //! @internal
     template<int N, class Variant, class H, class ... T, class Archive>
     typename std::enable_if<N < boost::mpl::size<typename Variant::types>::value, void>::type
     load_variant(Archive & ar, int target, Variant & variant)
diff --git a/include/cereal/types/memory.hpp b/include/cereal/types/memory.hpp
index 533733c3..83ab1504 100644
--- a/include/cereal/types/memory.hpp
+++ b/include/cereal/types/memory.hpp
@@ -111,6 +111,7 @@ namespace cereal
   // Pointer wrapper implementations follow below
 
   //! Saving std::shared_ptr (wrapper implementation)
+  /*! @internal */
   template <class Archive, class T> inline
   void save( Archive & ar, memory_detail::PtrWrapper<std::shared_ptr<T> const &> const & wrapper )
   {
@@ -126,6 +127,7 @@ namespace cereal
   }
 
   //! Loading std::shared_ptr, case when user load and allocate (wrapper implementation)
+  /*! @internal */
   template <class Archive, class T> inline
   typename std::enable_if<traits::has_load_and_allocate<T, Archive>(), void>::type
   load( Archive & ar, memory_detail::PtrWrapper<std::shared_ptr<T> &> & wrapper )
@@ -148,6 +150,7 @@ namespace cereal
   }
 
   //! Loading std::shared_ptr, case when no user load and allocate (wrapper implementation)
+  /*! @internal */
   template <class Archive, class T> inline
   typename std::enable_if<!traits::has_load_and_allocate<T, Archive>(), void>::type
   load( Archive & ar, memory_detail::PtrWrapper<std::shared_ptr<T> &> & wrapper )
@@ -171,6 +174,7 @@ namespace cereal
   }
 
   //! Saving std::unique_ptr (wrapper implementation)
+  /*! @internal */
   template <class Archive, class T, class D> inline
   void save( Archive & ar, memory_detail::PtrWrapper<std::unique_ptr<T, D> const &> const & wrapper )
   {
@@ -190,6 +194,7 @@ namespace cereal
   }
 
   //! Loading std::unique_ptr, case when user provides load_and_allocate (wrapper implementation)
+  /*! @internal */
   template <class Archive, class T, class D> inline
   typename std::enable_if<traits::has_load_and_allocate<T, Archive>(), void>::type
   load( Archive & ar, memory_detail::PtrWrapper<std::unique_ptr<T, D> &> & wrapper )
@@ -206,6 +211,7 @@ namespace cereal
   }
 
   //! Loading std::unique_ptr, case when no load_and_allocate (wrapper implementation)
+  /*! @internal */
   template <class Archive, class T, class D> inline
   typename std::enable_if<!traits::has_load_and_allocate<T, Archive>(), void>::type
   load( Archive & ar, memory_detail::PtrWrapper<std::unique_ptr<T, D> &> & wrapper )
diff --git a/include/cereal/types/queue.hpp b/include/cereal/types/queue.hpp
index f97d1116..4a4b78b8 100644
--- a/include/cereal/types/queue.hpp
+++ b/include/cereal/types/queue.hpp
@@ -38,6 +38,7 @@ namespace cereal
   namespace queue_detail
   {
     //! Allows access to the protected container in queue
+    /*! @internal */
     template <class T, class C> inline
     C const & container( std::queue<T, C> const & queue )
     {
@@ -53,6 +54,7 @@ namespace cereal
     }
 
     //! Allows access to the protected container in priority queue
+    /*! @internal */
     template <class T, class C, class Comp> inline
     C const & container( std::priority_queue<T, C, Comp> const & priority_queue )
     {
@@ -68,6 +70,7 @@ namespace cereal
     }
 
     //! Allows access to the protected comparator in priority queue
+    /*! @internal */
     template <class T, class C, class Comp> inline
     Comp const & comparator( std::priority_queue<T, C, Comp> const & priority_queue )
     {
diff --git a/include/cereal/types/set.hpp b/include/cereal/types/set.hpp
index 2a6c3aaa..8dde4296 100644
--- a/include/cereal/types/set.hpp
+++ b/include/cereal/types/set.hpp
@@ -37,6 +37,7 @@ namespace cereal
 {
   namespace set_detail
   {
+    //! @internal
     template <class Archive, class SetT> inline
     void save( Archive & ar, SetT const & set )
     {
@@ -46,6 +47,7 @@ namespace cereal
         ar( i );
     }
 
+    //! @internal
     template <class Archive, class SetT> inline
     void load( Archive & ar, SetT & set )
     {
diff --git a/include/cereal/types/tuple.hpp b/include/cereal/types/tuple.hpp
index bd6521ec..27619359 100644
--- a/include/cereal/types/tuple.hpp
+++ b/include/cereal/types/tuple.hpp
@@ -38,6 +38,7 @@ namespace cereal
   namespace tuple_detail
   {
     // unwinds a tuple to save it
+    //! @internal
     template <size_t Height>
     struct serialize
     {
@@ -50,6 +51,7 @@ namespace cereal
     };
 
     // Zero height specialization - nothing to do here
+    //! @internal
     template <>
     struct serialize<0>
     {
diff --git a/include/cereal/types/unordered_map.hpp b/include/cereal/types/unordered_map.hpp
index 7566d1c6..8d51dfbc 100644
--- a/include/cereal/types/unordered_map.hpp
+++ b/include/cereal/types/unordered_map.hpp
@@ -37,6 +37,7 @@ namespace cereal
 {
   namespace unordered_map_detail
   {
+    //! @internal
     template <class Archive, class MapT> inline
     void save( Archive & ar, MapT const & map )
     {
@@ -46,6 +47,7 @@ namespace cereal
         ar( make_map_item(i.first, i.second) );
     }
 
+    //! @internal
     template <class Archive, class MapT> inline
     void load( Archive & ar, MapT & map )
     {
diff --git a/include/cereal/types/unordered_set.hpp b/include/cereal/types/unordered_set.hpp
index 77efba7d..804df56c 100644
--- a/include/cereal/types/unordered_set.hpp
+++ b/include/cereal/types/unordered_set.hpp
@@ -37,6 +37,7 @@ namespace cereal
 {
   namespace unordered_set_detail
   {
+    //! @internal
     template <class Archive, class SetT> inline
     void save( Archive & ar, SetT const & set )
     {
@@ -46,6 +47,7 @@ namespace cereal
         ar( i );
     }
 
+    //! @internal
     template <class Archive, class SetT> inline
     void load( Archive & ar, SetT & set )
     {
diff --git a/unittests.cpp b/unittests.cpp
index 42343b39..88881b53 100644
--- a/unittests.cpp
+++ b/unittests.cpp
@@ -59,6 +59,14 @@ namespace boost
   }
 }
 
+
+namespace cereal
+{
+  template <class Archive, class T>
+    void serialize( Archive &, std::less<T> & )
+    { }
+}
+
 #define BOOST_TEST_DYN_LINK
 #define BOOST_TEST_MODULE Cereal
 #include <boost/test/unit_test.hpp>
@@ -1072,11 +1080,10 @@ BOOST_AUTO_TEST_CASE( binary_priority_queue )
   test_priority_queue<cereal::BinaryInputArchive, cereal::BinaryOutputArchive>();
 }
 
-// TODO: xml doesn't do empty classes by default, need std::less
-//BOOST_AUTO_TEST_CASE( xml_priority_queue )
-//{
-//  test_priority_queue<cereal::XMLInputArchive, cereal::XMLOutputArchive>();
-//}
+BOOST_AUTO_TEST_CASE( xml_priority_queue )
+{
+  test_priority_queue<cereal::XMLInputArchive, cereal::XMLOutputArchive>();
+}
 
 // ######################################################################
 template <class IArchive, class OArchive>