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以下 xml 存储在 Oracle 的 CLOB 字段中：

<?xml version="1.0" encoding="UTF-8"?>
<module modelCodeValue="TYPE_325" xmlns="http://www.test.com/2008/FMSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <tmEsObj modelCodeScheme="EO" modelCodeSchemeVersion="01" modelCodeValue="ES_OB_1" modelCodeMeaning="EO - desc">
    </tmEsObj>
    <tmProg modelCodeScheme="VO" modelCodeSchemeVersion="01" modelCodeValue="VO_08" modelCodeMeaning="PO- desc">
    </tmProg>
</module>

以下 sql 查询正确更新了标签 tmEsObj 和 tmProg 的属性：

UPDATE SR_DATA
  SET XMLDATA =
    XMLTYPE.GETCLOBVAL(XMLQuery('declare default element namespace "http://www.test.com/2008/FMSchema";
        copy $i := $p1 modify
                ((for $j in $i/module/tmEsObj/@modelCodeValue
                  return replace value of node $j with $p2),
                 (for $j in $i/module/tmEsObj/@modelCodeMeaning
                  return replace value of node $j with $p3),
                 (for $j in $i/module/tmProg/@modelCodeValue
                  return replace value of node $j with $p4),
                 (for $j in $i/module/tmProg/@modelCodeMeaning
                  return replace value of node $j with $p5)  
                )
                return $i'
             PASSING XMLType(xmldata) AS "p1",
                     'ES_OB_1a' AS "p2",
                     'EO ASI - desc' AS "p3",
                     'VO_08e' AS "p4",
                     'PO ASI - desc' AS "p5"
             RETURNING CONTENT))

但是从生成的 xml 中可以看出，编码已经改变

<?xml version="1.0" encoding="ISO-8859-1"?>
<module modelCodeValue="TYPE_325" xmlns="http://www.test.com/2008/FMSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <tmEsObj modelCodeScheme="EO" modelCodeSchemeVersion="01" modelCodeValue="ES_OB_1a" modelCodeMeaning="EO ASI - desc">
    </tmEsObj>
    <tmProg modelCodeScheme="VO" modelCodeSchemeVersion="01" modelCodeValue="VO_08e" modelCodeMeaning="PO ASI - desc">
    </tmProg>
</module>

有没有办法告诉系统从一开始就考虑正确的编码？否则如何在更新 xml 之前再次设置正确的编码？

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