XML is surging as one of the new approaches of infor ma tion representation, exchange and storage on WWW. Based on the Object Exchange M odel(OEM), firstly, the paper has introduced a concept of discrete XML schema fo r our XML database.

• XML正在迅速成为WWW上采用的信息交换、表示和存储手段之一,首先,本文基于OEM数据模型提出了离散的XML数据模式概念,并在此思想上发展出基于模式匹配的数据查询概念;