Learn about Queries. Point queries and segment queries (raycasting). 学习如何查询，指出查询的片断。 .
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Of course, the best way to learn about SPARQL is by writing some queries of your own.
当然，学习SPARQL的最好方法是编写一些自己的查询。
Look at the SPARQL spec to learn in detail about SPARQL's built-in functions, operators, query forms, and syntax, or to see many more example SPARQL queries.
请参阅SPARQL的规范，详细学习SPARQL的内置函数、操作符、查询格式和语法，或者参阅更多SPARQL查询示例。
XQuery 1.0 specification: Learn more about this XML language that makes intelligent use of XML structure to express queries across various XML data sources.
XQuery 1.0 规范：了解有关此 XML 语言的更多信息，该语言灵活使用 XML 结构表达跨各种 XML 数据源的查询。
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