You can improve it by adding the -l option to also track location information for the source document, though that data isn't always available and using -l does consume additional memory.
您可以通过添加- l选项来改善这一点，添加- l选项还可以跟踪源文档的位置信息，但是该数据并非始终都可用，并且使用- l选项确实会消耗额外的内存。
This is a URL to a service that takes a URL as a data source and returns the extracted information as an RDF document.
这个URL指向一个服务，该服务以一个URL为数据源，并将提取到的信息以rdf文档的形式返回。
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