xml的運用---知識管理工具(編輯修改稿)
2025-02-01 02:25 本頁面
【文章內(nèi)容簡介】 representation (baseName), can have any number of external references (occurrence) and any number of classification (instanceOf) ? Topics are only representants: they represent (proxy) the subject。 the subject itself exists outside the topic map This is what a subject is reified by a topic means and why subjectIdentity element is proposed. Topic (Example) Topic Names ? every topic has an unique id within a map ? this id is for internal use only ? every topic can have (one or more) names: – this name is visible to ?end users? Topic Name BaseName ? The baseName element specifies a topic name ? A topic name is represented by one string: the content of the baseNameString child of baseName ? The context within which the assignment of a name to a topic is valid may be expressed using a scope child element. ? A topic may have multiple base names in the same and/or multiple scopes. Topic Name Variant ? The variant element is an alternate form of a topic39。s base name appropriate for a processing context specified by the variant39。s parameters child element ? A variant name whose parameters include the ? display? or ? sort? published subjects, which is semantically equivalent to display names and sort names (respectively) as defined in ISO 13250. Variants ? variants are names for a specific purpose and/or in a specific format: ? name, as it should – appear on a mobile display – logo on blackwhite screen ? high resolution ? low resolution – be used for sorting Variants (cont?d) ? external representations – anized as a tree – parameters control which variant will be used Topic Types Topic Types (cont?d) ? topic types introduce a type hierarchy ? every topic map has its own type hierarchy ? there is NO global type system (ontology) Topic instanceOf ? The instanceOf element specifies the class to which its parent belongs, via a topicRef or subjectIndicatorRef child element. ? The instanceOf element is a syntactic shortcut for an association of a special type defined by the classinstance published subject. Topic Types (Example) Topic SubjectIdentity ? The subjectIdentity element specifies the subject that is reified by a topic, via resourceRef, subjectIndicatorRef, and/or topicRef child elements. ? When a topic has an addressable subject, the subject can be addressed directly via a resourceRef element. In that case, it is the resource itself which is considered the subject of the topic, not what the resource means or indicates. There can be only one such resource per topic. ? Resources may also be subject indicators, as opposed to subjects in and of themselves. Resources are used to indicate subjects via subjectIndicatorRef elements, of which there may be more than one per topic. ? A topic may also indicate that it has the same subject as another topic by addressing that topic via a topicRef element. Associations ? topics can participate in relationships, called a
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