为什么在扩展之前缩短了 id 的相对 IRI 中的基本前缀？

Question

我有一个 JSON-LD 文档，其中基本前缀没有像我预期的那样扩展，而是先缩短到它的根，然后附加 @id 数据：

{
    "@context": {
        "tag": "@type",
        "@base": "http://example.com/base#auth-1/",
        "Line": "lit:Line",
        "load": "book:load",
        "book": "http://gerastree.at/auth-1/",
        "lnum": "lit:lnum",
        "lline": {
            "@language": "deu",
            "@id": "lit:lines"
        },
        "lit": "http://gerastree.at/lit_2014#",
        "lid": "@id"
    },
    "loadid": "loadIDstring",
    "load": [
        {
            "tag": "Line",
            "lnum": 1,
            "lline": "asdf1",
            "lid": "1"
        },
        {
            "tag": "Line",
            "lnum": 2,
            "lline": "asdf2",
            "lid": "2"
        }
    ]
}

RIOT（或游乐场）然后给出：

 riot --syntax=jsonld --output=turtle lines.jsonld
@prefix lit:  <http://gerastree.at/lit_2014#> .
@prefix book:  <http://gerastree.at/auth-1/> .

_:b0    book:load  <http://example.com/1> ;
        book:load  <http://example.com/2> .

<http://example.com/1>
        <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>  lit:Line ;
        lit:lines  "asdf1"@deu ;
        lit:lnum   1 .

<http://example.com/2>
        <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>  lit:Line ;
        lit:lines  "asdf2"@deu ;
        lit:lnum   2 .

我无法理解为什么这两行的id只是<http://example.com/2>而不是<http://example.com/base#auth-1/2>。为什么基础前缀被缩短了？我可以改变什么来避免这种情况？

Answer 1

@base follows RFC 3986’s Establishing a Base URI，它说（大胆强调我的）：

If the base URI is obtained from a URI reference, then that reference must be converted to absolute form and stripped of any fragment component prior to its use as a base URI.

所以你的

"@base": "http://example.com/base#auth-1/",

将导致此基础 IRI：

http://example.com/base

如果您指定 "lid": "#auth-1/2" 而不是 "lid": "2"，您最终会得到 http://example.com/base#auth-1/2。

或者，您可以为这些值定义一个前缀，例如

"foobar": "http://example.com/base#auth-1/"

并使用

"lid": "foobar:2"

为什么在扩展之前缩短了 id 的相对 IRI 中的基本前缀？

Why is the base prefix in a relative IRI for an id shortened before expansion?

json-ld

base-url