OWL namespace is owl: http://www.w3.org/2002/07/owl#

    •Open World Assumption means

    • Can assert negative things, but cannot infer it from the absence of the positive thing (beware, database modellers!) 可以断言消极事物，但不能从积极事物的缺失中推断出消极事物
    • No unique names assumption: i.e cannot infer that two things are not the same because they have different names (URIs) 名称没有唯一性，不能由于名称不同，来推断出两个事物不同。

    •OWL is strongly typed OWL是强类型

    • Disjoint domains of individuals, classes, object properties, _datatype _properties, datatypes, annotation properties. 个人、类、对象属性、数据类型属性、数据类型、注释属性的不相交域。
    • Where the same name is used for different ones, they are different things (_punnin_g). 当相同的名字用于不同的名字时，它们是不同的东西(双关语)。

    •OWL modelling is about defining statements about the relationships between and amongst various classes, properties and individuals. 猫头鹰建模是关于定义各种类、属性和个体之间的关系的陈述。
    • There are two predefined classes: 有两个预定义的类别:
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    • There are two predefined object properties (similarly) 有两个预定义的对象属性(类似)image.png
    • And two predefined data properties (similarly) 和两个预定义的数据属性(类似)
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    • We have seen the predefined datatypes before: they are (some of) the XML Schema data types, such as xsd:integer and xsd:string.
    •There are also some annotation properties that are only for human readability and do not participate in the formal logical modelling. They are interpreted just as ordinary RDF. 还有一些注释属性仅用于人类可读性，不参与正式的逻辑建模。它们被解释为普通的RDF。
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