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。
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)。
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。
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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