從實現圖片數據庫可擴展性的角度，分析了傳統關系型數據庫解決這一問題的不足之處，提出了一個基于純XML數據庫的解決方案。該方案使用XML格式來描述和存儲圖片的元數據，利用XML的可擴展性、結構化存儲和XML數據庫Tamino可以隨時修改文檔模式，不會破壞數據庫中原有的數據，有效地實現了圖片數據庫的可擴展性，同時使圖片數據庫具有高效檢索和跨平臺的特點。
關 鍵 詞 圖片數據庫; 元數據; 可擴展標記語言; 純XML數據庫

Abstract There is no uniform standard to describe the metadata of photograph presently, and it is usually diffcult to get all the characters of photograph when building a Photograph Data Base(PDB). Therefore, higher extensibility is required for PDB system. In respect of the extensibility of PDB, this paper analyzes the shortcomings of traditional RDBMS and introduces a new solution based on Native XML-Database which uses XML format to describe and store the metadata of photographs. Making use of the extensibility and structural storage of XML, this solution effectively implements the extensibility of the PDB and enables high retrieval capability and cross-platform character of it.
Key words photograph-database; metadata; extensible markup language; native-XML database