通常，您不能依赖默认串行化格式来保持类的不同版本间的文件格式兼容性。
You usually can't rely on the default serialization format to retain file-format compatibility between different versions of a class.
默认的文件格式与OpenOffice 2.0及基于此开源代码的其他产品所使用的odf格式相同。
Their default is the same ODF format used by OpenOffice 2.0 and other products based on that open-source code.
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