The keys of the message map are strings that represent XPath expressions to access the leaf nodes of the business object.
消息映射的键是字符串，表示用于访问业务对象的叶子节点的XPath表达式。
The keys of the message map are strings that represent XPath expressions to access the leaf nodes of the business object.
消息映射的键是字符串，表示用于访问业务对象的叶子节点的XPath表达式。
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