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1·Relational world is based on error prevention; and normalization is used as a tool to remove duplication and prevent update anomalies.

关系数据库的世界是以防止错误为根基的；以正规化(normalization)为工具消除重复和防止更新异常。

2·The problem of XML redundancy detection with semantics is very meaningful to prevent update anomalies and the key problem of XML normalization theory.

XML保持语义下的冗余检测问题对于防止XML文档的更新异常和减少XML冗余信息的存储具有很大意义，是XML规范化理论的关键问题之一。