During backup, ignore already existing __contents__.xml files in the database. __contents__.xml is a reserved document used for backup metadata. If files with this name do exist in the database, the resulting .zip backup file will be corrupted.
During backup, ignore already existing __contents__.xml files in the database. __contents__.xml is a reserved document used for backup metadata. If files with this name do exist in the database, the resulting .zip backup file will be corrupted.

svn path=/trunk/eXist/; revision=5209

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