SPARQL is designed to query data represented with the RDF data model, which represents data as a collection of triples, each of which has a subject, a predicate, and an object.
SPARQL被设计用来查询以rdf数据模型表示的数据，这种数据模型用一个三元组来表示数据，每个三元组都具有一个主语、一个谓语和一个宾语。
To do this, you need to define sets of three XPath expressions: a subject expression, a predicate expression, and an object expression.
为此，您需要定义由三个 XPath 表达式组成的集：一个主语（subject）表达式、一个谓语（predicate）表达式和一个宾语（object）表达式。
RDF documents are made up of simple statements that consist of three parts each: the subject, the predicate, and the object (value).
RDF文档由一些简单的语句组成，每个语句包含三个部分：主语、谓语和宾语(值)。
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