目前，工业界和学术界提出了很多种XML查询语言，各种语言在语法形式和查询能力上都不尽相同。
At present, the industrial circles and academic made a lot of XML query language, grammatical forms and query capabilities in various languages are different.
而且，可以编写一个查询同时搜索和处理这两种数据形式。
Furthermore, they can write a single query that searches and integrates both forms of data.
其次，查询以大写形式引用表和列的名称。
Second, the query refers to the table and column names in upper case.
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