Since DB2 typically folds table and column names into upper case when writing this information to its internal catalogs, the XQuery must match this information.
因为当把该信息写入它的内部编目时，DB 2通常将表和列的名称转换成大写形式，所以XQuery必须匹配该信息。
The character which when preceded by an escape character represents any upper case character.
前跟转义字符用于表示任意大写字母的字符。
The character which when preceded by an escape character represents any upper case character.
前跟转义字符用于表示任意大写字母的字符。
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