Delphi6,7提供ADO RecordSet的LoadFromFile和SaveToFile方法
与Xml交互:

procedure LoadFromFile(const FileName: WideString);

Description

Call LoadFromFile to load the recordset for the calling ADO dataset component from a file. If the loading operation fails, the current recordset is neutralized (set to nil), the dataset component remains inactive, and an EOleException exception is raised. If the attempt to load data from a file is successful, the ADO dataset component is automatically activated and the data made available.

FileName is a string containing the name of the file.

LoadFromFile closes the dataset component before loading the recordset from the file specified in FileName.

其xml文档编码格式要求为utf8:

<xml xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema">
    <s:Schema />
            </s:AttributeType>

在D6中RecordSet.LoadFromFile后，RS中数据是存在的，但rs.FieldByName('C07').ToString Throw a Error

手工改变xml文件，将dt:maxleng配置为10，没有错误，但该字段被截取成10位长度了

看来只需在.Net端生成xml时将dt:maxleng配置得足够大
然而很不幸,dt:maxleng>8200+时(具体为多少没测试,当时急着改BUG)
出现问题和dt:maxleng=-1一样

看来只有使用小于8000的文本了