Since we override equals() on Pair, must also override hashCode().
Since we override equals() on Pair, must also override hashCode().

git-svn-id: 46308aa6df3a13aea5930e6665b35c8b83c3a711@518 9fbd0cf9-a10c-0410-82c1-be8c084f3200

duck1123/java-xmltooling