执行变换，指定XML文档和结果目标。
Perform the transformation, specifying the XML document and result target.
经理——不对具体迭代的目标负责，但对整个组织负责——可以建议一个人变换一下角色，去承担不同的责任。
A manager - one who is not responsible for a specific iteration's goals but is responsible to the organization - can suggest alternatives for a person to take on different responsibilities.
这种方法本质上相当于通过弹性将各种数据点连接在一起，并且允许该系统进行弛豫（弛豫时间：达到目标状态所需的时间）；因此它被命名为“弹性变换”。
This technique is essentially equivalent to connecting various data points together with springs and allowing the system to relax; hence it's name: elastic mapping.
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