我想使用sparql从dbpedia获取摘要。我想在Visual Studio C#的ASP .NET中的查询下面运行。这是我所做的。
<script>
var query= "\
PREFIX dbpedia: <http://dbpedia.org/resource/>\
PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>\
SELECT ?abstract\
WHERE {\
?s dbpedia:Junagadh
dbpedia-owl:abstract ?abstract\
}";
var queryUrl = url + "?query=" + encodeURIComponent(query) + "&format=json";
$.ajax({
dataType: "jsonp",
url: queryUrl,
success: function (_data) {
var results = _data.results.bindings;
for (var i in results) {
var src = results[i].abstract.value;
$('body').append(src);
}
}
});
我想抽象化浏览器中输入的搜索词。我在这里输入了“印度”。当我运行此代码时,我无法在浏览器中获得输出。
所以我的问题是如何从javascript执行此查询并在浏览器中获取结果?
请帮助我,谢谢。
编辑#1:
我试过为您建议示例链接来运行sparql查询。我尝试了示例中给出的代码,但在第17行中得到如下错误。
Version number '1.1' is invalid. Line 1, position 16.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Xml.XmlException: Version number '1.1' is invalid. Line 1, position 16.
source Error:
Line 16: //Make a SELECT query against the Endpoint
Line 17: SparqlResultSet results = endpoint.QueryWithResultSet("SELECT DISTINCT ?Concept WHERE {[] a ?Concept}");
Line 18: foreach (SparqlResult result in results)
Line 19: {
Stack Trace:
[XmlException: Version number '1.1' is invalid. Line 1, position 16.]
System.Xml.XmlTextReaderImpl.Throw(Exception e) +76
System.Xml.XmlTextReaderImpl.Throw(String res, String arg) +126
System.Xml.XmlTextReaderImpl.ParseXmlDeclaration(Boolean isTextDecl) +3983351
System.Xml.XmlTextReaderImpl.Read() +239
VDS.RDF.Parsing.SparqlXmlParser.Parse(SparqlXmlParserContext context) in e:\mercurial\dotnetrdf\Libraries\core\net40\Parsing\SPARQLXMLParser.cs:376
VDS.RDF.Parsing.SparqlXmlParser.Load(ISparqlResultsHandler handler, TextReader input) in e:\mercurial\dotnetrdf\Libraries\core\net40\Parsing\SPARQLXMLParser.cs:101
VDS.RDF.Parsing.SparqlXmlParser.Load(ISparqlResultsHandler handler, StreamReader input) in e:\mercurial\dotnetrdf\Libraries\core\net40\Parsing\SPARQLXMLParser.cs:124
VDS.RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet(ISparqlResultsHandler handler, String sparqlQuery) in e:\mercurial\dotnetrdf\Libraries\core\net40\Query\SPARQLRemoteEndpoint.cs:309
VDS.RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet(String sparqlQuery) in e:\mercurial\dotnetrdf\Libraries\core\net40\Query\SPARQLRemoteEndpoint.cs:284
test.Page_Load(Object sender, EventArgs e) in c:\Users\MKS\Documents\Visual Studio 2010\WebSites\WebSite3\test.aspx.cs:17
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627
请帮助我,谢谢。
您的查询完全错误。在编写SPARQL查询时,您需要询问一个三元组?s ?p ?o
。如果您查看查询,那里有4个项目。因此,如果您需要所有语言的摘要,则需要提出以下要求:
SELECT ?abstract
WHERE {
dbpedia:Junagadh dbpedia-owl:abstract ?abstract.
}
如果您需要抽象的特定语言,则需要对其进行相应的过滤。例如,英文摘要为:
SELECT ?abstract
WHERE {
dbpedia:Junagadh dbpedia-owl:abstract ?abstract.
filter(lang(?abstract)='en')
}
如果您需要了解如何在.net环境中编写SPARQL,请阅读以下示例。
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我来说两句