The set animation type sets a property or attribute to a value without performing the change over time.
set动画类型将特性或属性设置为某个值，而不是随时间变化来执行更改。
The value of the test attribute on xs:alternative corresponds to the test property, an XPath expression which evaluates to true or false.
alternative 上的 test 属性的值对应于 test 属性，后者是一个值为 true 或 false 的 XPath 表达式。
An attribute of an object is represented by a Property which can be a primitive type or a reference to another object.
对象的属性由Property表示，它可以是基元类型，也可以是对另一个对象的引用。
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