PHP EasyRDF:无法从构造查询获取图形

这个问题是由EasyRDF发出的HTTP请求头暴露出来的,并发布在您的答案中(所有这些额外的细节实际上都应该编辑到您的问题中)。

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

text/html 或 application/xhtml+xml ,然后更愿意 application/xml ,后跟 */* 或“任何媒体类型”。

事实并非如此! 是 不 也不比 在这种情况下。

文本/html ... EasyRDF不把它当作一个图来处理也就不足为奇了。

application/n-quads ,它不是EasyRDF请求的任何特定MIME类型)

EasyRDF公司 text/turtle , application/rdf+xml , application/trig , application/n-triples , application/ld+json , sparql-results+xml Accept: 标题)。EasyRDF还应该指出,这些(可能带有内部优先顺序)优先于任何非RDF MIME类型(包括EasyRDF当前请求的所有特定MIME类型)或通配符( */*

这应该是 reported as a bug in EasyRDF @TallTed on github )在你的报告里。

a solution

似乎返回的对象类型( EasyRdf_Graph / EasyRdf_Sparql_Result )视情况而定 Accept 标头的参数。我试图修改它(添加了中列出的不同内容类型) Virtuoso doc )通过Firebug重新发送请求,但没有收到任何请求 EasyRdf\ U图

正如Ted所问,下面是请求头的相关部分(使用上面的php代码和EasyRDF 0.0.1):

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: keep-alive

print_r(get_headers($endpointUrl));

下面是Fuseki的响应头(它给出了一个 对象):

[0] => HTTP/1.1 200 OK
[1] => Date: Tue, 11 Sep 2018 06:14:56 GMT
[2] => Fuseki-Request-ID: 13
[3] => Vary: Accept,Accept-Encoding,Accept-Charset
[4] => Content-Type: application/n-quads
[5] => Vary: User-Agent

http://data.bnf.fr )

[0] => HTTP/1.1 302 Found
[1] => Date: Tue, 11 Sep 2018 06:12:29 GMT
[2] => Server: Apache
[3] => Location: http://data.bnf.fr/sparql/
[4] => Content-Length: 210
[5] => Content-Type: text/html; charset=iso-8859-1
[6] => Vary: Accept-Encoding,User-Agent
[7] => Connection: close
[8] => HTTP/1.1 200 OK
[9] => Date: Tue, 11 Sep 2018 06:12:29 GMT
[10] => Server: Apache
[11] => Last-Modified: Mon, 19 Feb 2018 10:34:21 GMT
[12] => ETag: "200036-3a99-5658e3ca8a540"
[13] => Accept-Ranges: bytes
[14] => Content-Length: 15001
[15] => Vary: Accept-Encoding,User-Agent
[16] => Access-Control-Allow-Origin: *
[17] => Content-Type: text/html
[18] => Content-Language: fr
[19] => Connection: close

注:用于数据.bnf.fr代码是302(重定向),但似乎没有任何区别,请参阅dbpedia响应:

[0] => HTTP/1.1 200 OK
[1] => Date: Tue, 11 Sep 2018 07:17:23 GMT
[2] => Content-Type: text/html; charset=UTF-8
[3] => Content-Length: 14172
[4] => Connection: close
[5] => Vary: Accept-Encoding
[6] => Server: Virtuoso/07.20.3229 (Linux) i686-generic-linux-glibc25-64  VDB
[7] => Expires: Tue, 18 Sep 2018 07:17:23 GMT
[8] => Cache-Control: max-age=604800
[9] => Access-Control-Allow-Origin: *
[10] => Access-Control-Allow-Credentials: true
[11] => Access-Control-Allow-Methods: GET, POST, OPTIONS
[12] => Access-Control-Allow-Headers: DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Accept-Encoding
[13] => Accept-Ranges: bytes

使用新php代码和composer更新的解决方案

1) 编辑编写器.json:

{
    "require": {
        "easyrdf/easyrdf": "dev-master"
    }
}

php composer.phar update

3) 重写php代码:

require_once './third_party/vendor/autoload.php';
$endpointUrl = "http://data.bnf.fr/sparql";        
$dummyConstructQueryString = "construct { ?s ?q ?r } where { ?s ?p ?o . ?o ?q ?r } limit 1";        
$endPoint = new \EasyRdf\Sparql\Client($endpointUrl); // <-- here use the namespace
$result = $endPoint->query($dummyConstructQueryString);                
var_dump($result);

编辑

EasyRdf\ U图 对象。以下是请求和响应的标头,带有更新的Easyrdf代码(“dev master”版本)。也许EasyRDF解析查询和结果来构建一个 EasyRdf\ U图

•  Host: localhost
   User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0
   Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
   Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
   Accept-Encoding: gzip, deflate
   DNT: 1
   Connection: keep-alive
   Upgrade-Insecure-Requests: 1
   Cache-Control: max-age=0
  

• 回应 http://data.bnf.fr/sparql/ (通过以下方式获得) print_r(get_headers($endpointUrl));

   [0] => HTTP/1.1 302 Found
   [1] => Date: Wed, 12 Sep 2018 06:21:48 GMT
   [2] => Server: Apache
   [3] => Location: http://data.bnf.fr/sparql/
   [4] => Content-Length: 210
   [5] => Content-Type: text/html; charset=iso-8859-1
   [6] => Vary: Accept-Encoding,User-Agent
   [7] => Connection: close
   [8] => HTTP/1.1 200 OK
   [9] => Date: Wed, 12 Sep 2018 06:21:48 GMT
   [10] => Server: Apache
   [11] => Last-Modified: Mon, 19 Feb 2018 10:34:21 GMT
   [12] => ETag: "200036-3a99-5658e3ca8a540"
   [13] => Accept-Ranges: bytes
   [14] => Content-Length: 15001
   [15] => Vary: Accept-Encoding,User-Agent
   [16] => Access-Control-Allow-Origin: *
   [17] => Content-Type: text/html
   [18] => Content-Language: fr
   [19] => Connection: close