分析模型：一个高度抽象的模型，包含了解决方案的代表元素，而不包含任何具体的平台或结构方面的考虑。
Analysis model: a highly abstract model containing elements representative of the solution, yet without any platform - or architecture-specific concerns.
注意，不区分大小写只应用于元素和属性值，而不应用于标记名本身。
Note that the case insensitivity only applies to element and attribute values, not to the tag names themselves.
乙二胺四乙酸铁钠和元素羰基铁粉在贮藏过程中变化不大，而硫酸亚铁和柠檬酸铁铵在贮藏过程中绝大部分变成了不溶性铁。
The change of sodium ferric EDTA and carbonyl iron was not great, but most of ferric sulfate and ferric ammonium citrate became insoluble during storage.
使用指定的编写器写入XML内容，而不写入包装元素。
Writes the XML content without the wrapping element using the specified writer.
使用指定的编写器写入XML内容，而不写入包装元素。
Writes the XML content without the wrapping element using the specified writer.
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