Id is the extension point identifier.

id是扩展点标识符。

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The schema must declare the extension element (with three attributes: id, name, and point).

该模式必须声明extension元素(带有三个属性：id、name和point)。

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The schema must declare the extension element (with three attributes: id, name, and point).

该模式必须声明extension元素(带有三个属性：id、name和point)。

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