git-svn-id: https://qlanguage.googlecode.com/svn/trunk@206 6d982bb3-a5a7-393d-ffc5-582415be9c85
修改BNF

git-svn-id: https://qlanguage.googlecode.com/svn/trunk@207 6d982bb3-a5a7-393d-ffc5-582415be9c85