fixed reverse mapping

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2788 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
fixed mapping of document elements

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2789 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
fixed ID mapper

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2790 1f8fe7d8-47f0-464c-8d0a-336f4953ab05