Mickey Rose dad0bdacfc add value_null operators, improve is_null, move mapnik::value definition into separate namespace ... (cherry picked from commit 653bca6bea1abb2e45c66e76fd5e4fe7dc10a91a)		2012-06-06 17:34:17 +02:00
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mapnik	add value_null operators, improve is_null, move mapnik::value definition into separate namespace	2012-06-06 17:34:17 +02:00