add DOCTYPE, fix up conformance to DTD, change release notes about using xsd instead of doctype
add DOCTYPE, fix up conformance to DTD, change release notes about using xsd instead of doctype


git-svn-id: 4b064e69dc630d28214c1e1442d27300cccf8e9a@167441 c90b9560-bf6c-de11-be94-00142212c4b1

DQNEO/PEAR_Exception