preliminary mark-up for xpressive

[SVN r31265]

status/explicit-failures-markup.xml

@@ -3249,6 +3249,21 @@ for more information.
 
     </library>
 
+    <!-- xpressive -->
+    <library name="xpressive">
+
+        <mark-unusable>
+            <toolset name="msvc*"/>
+            <toolset name="vc-6_5*"/>
+            <toolset name="vc-7_0"/>
+            <note author="Eric Niebler">
+                These compilers do not support class template partial
+                specialization.
+            </note>
+        </mark-unusable>
+
+    </library>
+
     <!-- /////////////// Standard note definitions /////////////// -->
 
     <note id="0">