All that you can do in this case is to define a generic, unrestrictive property description for each ad-hoc property, and use it to create each property object.

在这种情况下，只需为每个专用属性定义一个一般的不受限制的属性描述，并使用它创建每个Property对象。

youdao

RDF statements are made up of triples (subject, property, object).

RDF陈述是一个三元组(主题、属性、对象)。

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Property object. Because this returns an object, any type of property is accessible.

因为它返回一个对象，所以任何类型的属性都是可访问的。

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But gravity has a remarkable property that the pull of the Earth is itself proportional to the inertia of the object.

重力有一个显著特征,即地球的引力,与物体的质量成比例

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It is unsupported to set values for the shadowOffset or shadowColor properties of a UILabel object if its attributedText property contains a valid attributed string.

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So if one atheist or attention-grabbing student in a public school is offended by a prayer, the Ten Commandments or a nativity scene on school property, liberals demand that the offending object must go.

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While the environmental group is given a seat at the negotiating table, private property owners and other affected residents are not given the opportunity to object to these settlements.

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