耶拿(Jena)将路径/URL添加到URI [英] Jena adds path/url to URIs

问题描述

我刚刚开始使用RDF和Jena. 我得到了一个RDF模型，我想再次读取，修改和写出它. 假设我的模型文件位于http://xyz/model.ttl，并且包含带有URI"someURI"的元素. 当我这样做

I just started working with RDF and Jena. I got a RDF model which I want to read, modify and write out again. Assume my model file is located at http://xyz/model.ttl and contains an element with URI "someURI". When I do

Model model = ModelFactory.createDefaultModel();
model.read("http://xyz/model.ttl", "", "TURTLE");
model.write(System.out, "TURTLE");

输出中的URI从"someURI"更改为http://xyz/someURI. 当我从本地文件系统读取模型时，URI更改为file://pathToFile/someURI. 有没有办法避免这种行为并保持URI不变?

the URI in the output changes from "someURI" to http://xyz/someURI. When I read the model from the local filesystem, the URI changes to file://pathToFile/someURI. Is there a way to avoid this behaviour and keep the URI unchanged?

推荐答案

在RDF(例如HTML)中，相对于基本URL(通常是源文档的URL)解析URL(/URI/IRI).

In RDF (like HTML) URLs (/ URIs / IRIs) are resolved relative to a base URL, typically the URL of the source document.

因此，在http://xyz/model.ttl中读取someURI变为http://xyz/someURI，并且从文件中获得file://pathToFile/someURI.

So reading someURI in http://xyz/model.ttl becomes http://xyz/someURI, and from a file you get file://pathToFile/someURI.

您可以通过提供一个明确的基数来避免这种情况，这将使结果URL在各个源之间保持一致.

You can avoid this by supplying an explicit base, which will make the resulting URLs consistent across sources.

model.read("http://xyz/model.ttl", "http://xyz/model.ttl", "TURTLE");
// or with same result
model.read(fileSource, "http://xyz/model.ttl", "TURTLE");

并相对化结果:

model.write(System.out, "TURTLE", "http://xyz/model.ttl");

(文档指出，已将写作，这似乎很奇怪)

(The documentation states that the base and lang arguments are switched for reading and writing, which seems odd)

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