completed the example, added the source file, and added docs for

associative_property_map


[SVN r12859]

libs/property_map

@@ -1 +1 @@
-Subproject commit 048468b6379bf10d55e8320db626008f3cbbdca5
+Subproject commit 94b60ef9af37c567c0fe7085c9e828a8d2cd07ea