escape xml chars

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12510 b70326c6-7e19-0410-871a-916f4a2858ee
fix dangling tag

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12511 b70326c6-7e19-0410-871a-916f4a2858ee
let's try this again

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12512 b70326c6-7e19-0410-871a-916f4a2858ee