sparql rdfs：range不返回任何内容

Question

我正在尝试运行查询以获取class ReadDataTable { private SpreadsheetDocument _document; private WorkbookPart _workbookPart; private Sheets _sheets; public ReadDataTable(string newFileName) { _document = SpreadsheetDocument.Open(newFileName, true); _workbookPart = _document.WorkbookPart; _sheets = _workbookPart.Workbook.AppendChild<Sheets>(new Sheets()); } public void AddItems (DataTable dt) { WorksheetPart worksheetPart = _workbookPart.AddNewPart<WorksheetPart>(); Worksheet workSheet = new Worksheet(); SheetData sheetData = new SheetData(); worksheetPart.Worksheet = workSheet; workSheet.AppendChild(sheetData); sheetData = worksheetPart.Worksheet.Elements<SheetData>().First(); Row header = new Row(); sheetData.Append(header); Cell Header1 = ConstructCell("Name", CellValues.String); Cell Header2 = ConstructCell("Salary", CellValues.String); Cell Header3 = ConstructCell("Birthdate", CellValues.String); header.Append(Header1, Header2, Header3); Row newRow = new Row(); foreach (DataRow itemRow in dt.Rows) { newRow = new Row(); foreach (object item in itemRow.ItemArray) { newRow.Append( ConstructCell(item.ToString(), CellValues.String)); } sheetData.Append(newRow); } Sheet sheet = new Sheet() { Id = _document.WorkbookPart.GetIdOfPart(worksheetPart), Name = dt.TableName }; _sheets.Append(sheet); } public void Save() { _document.Close(); _document.Dispose(); } private Cell ConstructCell(string value, CellValues dataType) { return new Cell() { CellValue = new CellValue(value), DataType = new EnumValue<CellValues>(dataType) }; } } 个不同的谓词。这是我的查询：

rdfs:range

但是查询返回一个空表作为return。我可以在PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> select DISTINCT * FROM <http://dbpedia.org> where{ ?s ?p ?o. ?p rdfs:range ?t. FILTER (?p = <http://dbpedia.org/ontology/spouse>) } LIMIT 10 上运行其他查询，但是dbpedia却存在此问题。我正在使用virtuoso openlink进行rdf存储。

我使用以下命令添加了它们：

rdfs:range