XML-to-relational mapping storage is a principal settlement of XML data management and sharing. The approach maps XML Schema to relational schema is the core of XML schema mapping storage. In order to address the strong dynamics of XML, incremental mapping approach is urgently needed. An incremental approach of X-R mapping named "T-Schema" is proposed. It extends P-Schema approach and introduces tag system and integration mechanism of relational schema increment. T-Schema realized incremental X-R mapping and integrate new relational schema and old one. This ensures the continued use of historical data which are important for many applications. The results of experiments show that T-Schema approach is efficient and effective in the application with complex XML Schema and large amounts of data.
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