public static INode ToNode(this EntityId entityId, INodeFactory factory) { if (entityId is BlankId) { return factory.CreateBlankNode(entityId.Uri.Authority); } return factory.CreateUriNode(entityId.Uri); }
public static INode ToNode(this EntityId entityId, INodeFactory factory) { if (entityId is BlankId) { return(factory.CreateBlankNode(entityId.Uri.Authority)); } return(factory.CreateUriNode(entityId.Uri)); }
public static INode AsValueNode(this INodeFactory nodeFactory, object value) { if (value == null) { return(null); } switch (value) { case Uri uriValue: return(nodeFactory.CreateUriNode(uriValue)); case bool boolValue: return(new BooleanNode(null, boolValue)); case byte byteValue: return(new ByteNode(null, byteValue)); case DateTime dateTimeValue: return(new DateTimeNode(null, dateTimeValue)); case DateTimeOffset dateTimeOffsetValue: return(new DateTimeNode(null, dateTimeOffsetValue)); case decimal decimalValue: return(new DecimalNode(null, decimalValue)); case double doubleValue: return(new DoubleNode(null, doubleValue)); case float floatValue: return(new FloatNode(null, floatValue)); case long longValue: return(new LongNode(null, longValue)); case int intValue: return(new LongNode(null, intValue)); case string stringValue: return(new StringNode(null, stringValue, UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeString))); case char charValue: return(new StringNode(null, charValue.ToString(), UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeString))); case TimeSpan timeSpanValue: return(new TimeSpanNode(null, timeSpanValue)); default: throw new InvalidOperationException($"Can't convert type {value.GetType()}"); } }
internal static INode TryParseNodeValue(INodeFactory factory, String value) { try { if (value.StartsWith("_:")) { return(factory.CreateBlankNode(value.Substring(2))); } else if (value.StartsWith("<")) { return(factory.CreateUriNode(new Uri(UnescapeValue(value.Substring(1, value.Length - 2))))); } else { if (value.EndsWith("\"")) { return(factory.CreateLiteralNode(UnescapeValue(value.Substring(1, value.Length - 2)))); } else if (value.EndsWith(">")) { String lit = value.Substring(1, value.LastIndexOf("^^<") - 2); String dt = value.Substring(lit.Length + 5, value.Length - lit.Length - 6); return(factory.CreateLiteralNode(UnescapeValue(lit), new Uri(UnescapeValue(dt)))); } else { String lit = value.Substring(1, value.LastIndexOf("\"@") - 1); String lang = value.Substring(lit.Length + 3); return(factory.CreateLiteralNode(UnescapeValue(lit), UnescapeValue(lang))); } } } catch (Exception ex) { throw new RdfParseException("Failed to parse the value '" + value + "' into a valid Node: " + ex.Message, ex); } }
/// <summary>Converts a RomanticWeb's <see cref="Node"/> into dotNetRDF's <see cref="INode"/>.</summary> public static INode UnWrapNode(this Node node, INodeFactory nodeFactory) { if (node.IsUri) { return nodeFactory.CreateUriNode(node.Uri); } if (node.IsLiteral) { if (node.Language != null) { return nodeFactory.CreateLiteralNode(node.Literal, node.Language); } if (node.DataType != null) { return nodeFactory.CreateLiteralNode(node.Literal, node.DataType); } return nodeFactory.CreateLiteralNode(node.Literal); } return nodeFactory.CreateBlankNode(node.BlankNode); }
/// <summary>Converts a RomanticWeb's <see cref="Node"/> into dotNetRDF's <see cref="VDS.RDF.INode"/>.</summary> public static VDS.RDF.INode UnWrapNode(this Model.INode node, INodeFactory nodeFactory) { if (node.IsUri) { return(nodeFactory.CreateUriNode(node.Uri)); } if (node.IsLiteral) { if (node.Language != null) { return(nodeFactory.CreateLiteralNode(node.Literal, node.Language)); } if (node.DataType != null) { return(nodeFactory.CreateLiteralNode(node.Literal, node.DataType)); } return(nodeFactory.CreateLiteralNode(node.Literal)); } return(nodeFactory.CreateBlankNode(node.BlankNode)); }
/// <summary> /// Copies a Node using another Node Factory /// </summary> /// <param name="original">Node to copy</param> /// <param name="target">Factory to copy into</param> /// <returns></returns> /// <remarks> /// <para> /// <strong>Warning:</strong> Copying Blank Nodes may lead to unforseen circumstances since no remapping of IDs between Factories is done /// </para> /// </remarks> public static INode CopyNode(INode original, INodeFactory target) { if (ReferenceEquals(original.Graph, target)) return original; switch (original.NodeType) { case NodeType.Blank: return target.CreateBlankNode(((IBlankNode)original).InternalID); case NodeType.GraphLiteral: return target.CreateGraphLiteralNode(((IGraphLiteralNode)original).SubGraph); case NodeType.Literal: ILiteralNode lit = (ILiteralNode)original; if (lit.DataType != null) { return target.CreateLiteralNode(lit.Value, lit.DataType); } else if (!lit.Language.Equals(String.Empty)) { return target.CreateLiteralNode(lit.Value, lit.Language); } else { return target.CreateLiteralNode(lit.Value); } case NodeType.Uri: return target.CreateUriNode(((IUriNode)original).Uri); case NodeType.Variable: return target.CreateVariableNode(((IVariableNode)original).VariableName); default: throw new RdfException("Unable to Copy '" + original.GetType().ToString() + "' Nodes between Node Factories"); } }
private static List <Triple> ConvertWeatherData(WeatherDataDto weather, Dictionary <string, WeatherStationDto> stations) { var triples = new TripleBuilder(nodeFactory.AsBlankNode(weather.NodeId)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.Type), nodeFactory.AsValueNode(Constants.Types.WeatherData)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataStation), nodeFactory.AsValueNode(weather.station)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataAlti), nodeFactory.AsValueNode(weather.alti)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataDrct), nodeFactory.AsValueNode(weather.drct)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataDwpc), nodeFactory.AsValueNode(weather.dwpc)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataDwpf), nodeFactory.AsValueNode(weather.dwpf)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataFeelc), nodeFactory.AsValueNode(weather.feelc)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataFeelf), nodeFactory.AsValueNode(weather.feelf)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataGust), nodeFactory.AsValueNode(weather.gust)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataIceAccretion1hr), nodeFactory.AsValueNode(weather.ice_accretion_1hr)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataIceAccretion3hr), nodeFactory.AsValueNode(weather.ice_accretion_3hr)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataIceAccretion6hr), nodeFactory.AsValueNode(weather.ice_accretion_6hr)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataLatitude), nodeFactory.AsValueNode(weather.lat)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataLongitude), nodeFactory.AsValueNode(weather.lon)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataMetar), nodeFactory.AsValueNode(weather.metar)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataMslp), nodeFactory.AsValueNode(weather.mslp)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataP01i), nodeFactory.AsValueNode(weather.p01i)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataPeakWindDrct), nodeFactory.AsValueNode(weather.peak_wind_drct)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataPeakWindGust), nodeFactory.AsValueNode(weather.peak_wind_gust)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataPeakWindTime_hh), nodeFactory.AsValueNode(weather.peak_wind_time_hh)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataPeakWindTime_MM), nodeFactory.AsValueNode(weather.peak_wind_time_MM)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataRelh), nodeFactory.AsValueNode(weather.relh)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSknt), nodeFactory.AsValueNode(weather.sknt)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyc1), nodeFactory.AsValueNode(weather.skyc1)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyc2), nodeFactory.AsValueNode(weather.skyc2)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyc3), nodeFactory.AsValueNode(weather.skyc3)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyc4), nodeFactory.AsValueNode(weather.skyc4)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyl1), nodeFactory.AsValueNode(weather.skyl1)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyl2), nodeFactory.AsValueNode(weather.skyl2)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyl3), nodeFactory.AsValueNode(weather.skyl3)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataSkyl4), nodeFactory.AsValueNode(weather.skyl4)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataTimestamp), nodeFactory.AsValueNode(weather.valid)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataTmpc), nodeFactory.AsValueNode(weather.tmpc)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataTmpf), nodeFactory.AsValueNode(weather.tmpf)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataVsbyKm), nodeFactory.AsValueNode(weather.vsby_km)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataVsbyMi), nodeFactory.AsValueNode(weather.vsby_mi)); triples.Add(nodeFactory.CreateUriNode(Constants.Predicates.WeatherDataWxcodes), nodeFactory.AsValueNode(weather.wxcodes)); if (stations.TryGetValue(weather.station, out WeatherStationDto station)) { triples.Add(nodeFactory.AsUriNode(Constants.Predicates.HasStation), nodeFactory.AsBlankNode(station.NodeId)); } return(triples.Build()); }
public static INode AsUriNode(this INodeFactory nodeFactory, Uri uri) { return(nodeFactory.CreateUriNode(uri)); }
internal static INode TryParseNodeValue(INodeFactory factory, String value) { try { if (value.StartsWith("_:")) { return factory.CreateBlankNode(value.Substring(2)); } else if (value.StartsWith("<")) { return factory.CreateUriNode(new Uri(UnescapeValue(value.Substring(1, value.Length - 2)))); } else { if (value.EndsWith("\"")) { return factory.CreateLiteralNode(UnescapeValue(value.Substring(1, value.Length - 2))); } else if (value.EndsWith(">")) { String lit = value.Substring(1, value.LastIndexOf("^^<") - 2); String dt = value.Substring(lit.Length + 5, value.Length - lit.Length - 6); return factory.CreateLiteralNode(UnescapeValue(lit), new Uri(UnescapeValue(dt))); } else { String lit = value.Substring(1, value.LastIndexOf("\"@") - 1); String lang = value.Substring(lit.Length + 3); return factory.CreateLiteralNode(UnescapeValue(lit), UnescapeValue(lang)); } } } catch (Exception ex) { throw new RdfParseException("Failed to parse the value '" + value + "' into a valid Node: " + ex.Message, ex); } }
/// <summary> /// Gets the Nodes that the algorithm should generate the descriptions for /// </summary> /// <param name="factory">Factory to create Nodes in</param> /// <param name="context">SPARQL Evaluation Context</param> /// <returns></returns> private List<INode> GetNodes(INodeFactory factory, SparqlEvaluationContext context) { INamespaceMapper nsmap = (context.Query != null ? context.Query.NamespaceMap : new NamespaceMapper(true)); Uri baseUri = (context.Query != null ? context.Query.BaseUri : null); //Build a list of INodes to describe List<INode> nodes = new List<INode>(); foreach (IToken t in context.Query.DescribeVariables) { switch (t.TokenType) { case Token.QNAME: case Token.URI: //Resolve Uri/QName nodes.Add(factory.CreateUriNode(new Uri(Tools.ResolveUriOrQName(t, nsmap, baseUri)))); break; case Token.VARIABLE: //Get Variable Values String var = t.Value.Substring(1); if (context.OutputMultiset.ContainsVariable(var)) { foreach (ISet s in context.OutputMultiset.Sets) { INode temp = s[var]; if (temp != null) nodes.Add(temp); } } break; default: throw new RdfQueryException("Unexpected Token '" + t.GetType().ToString() + "' in DESCRIBE Variables list"); } } return nodes; }
/// <summary> /// This method is called for every Lambda invocation. This method takes in an S3 event object and can be used /// to respond to S3 notifications. /// </summary> /// <param name="s3Event"></param> /// <param name="context"></param> /// <returns></returns> public async Task FunctionHandler(S3Event s3Event, ILambdaContext context) { foreach (var record in s3Event.Records) { try { using (GetObjectResponse response = await _s3Client.GetObjectAsync(new GetObjectRequest() { BucketName = record.S3.Bucket.Name, Key = record.S3.Object.Key })) { using (StreamReader reader = new StreamReader(response.ResponseStream)) { // // get main face // var selfieDetail = JsonConvert.DeserializeObject <SelfieDetail>(await reader.ReadToEndAsync()); var mainFace = selfieDetail.FacesDetails.OrderByDescending(faceDetail => faceDetail.BoundingBox.Width * faceDetail.BoundingBox.Height).First(); // // load selfies graph // IGraph selfiesGraph = new Graph(); _blazegraph.LoadGraph(selfiesGraph, UriFactory.Create(SELFIES_GRAPH)); // // create triples // INode imageNode = null; try { imageNode = _nodeFactory.CreateUriNode(UriFactory.Create(Uri.EscapeUriString("http://blazegraph-webapp/" + selfieDetail.ImageName))); } catch (Exception ex) { context.Logger.LogLine(ex.Message); return; } var triples = new List <Triple>(); // image instance is of type Selfie class triples.Add(new Triple( subj: imageNode, pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")), obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie")) )); // image instance label triples.Add(new Triple( subj: imageNode, pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDFS + "label")), obj: _nodeFactory.CreateLiteralNode(selfieDetail.ImageName, new Uri(XmlSpecsHelper.XmlSchemaDataTypeString)) )); // image instance has a faceDetail instance triples.Add(new Triple( subj: imageNode, pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/hasFaceDetail")), obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)) )); // faceDetail instance is of type FaceDetail class triples.Add(new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")), obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail")) )); // filling faceDetail attributes triples.AddRange(new List <Triple>() { new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/isGender")), obj: _nodeFactory.CreateLiteralNode(mainFace.Gender.Value.ToString().ToLower(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeString)) ), new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/hasMinAge")), obj: _nodeFactory.CreateLiteralNode(mainFace.AgeRange.Low.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeInteger)) ), new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/hasMaxAge")), obj: _nodeFactory.CreateLiteralNode(mainFace.AgeRange.High.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeInteger)) ), new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/isSmiling")), obj: _nodeFactory.CreateLiteralNode(Convert.ToInt32(mainFace.Smile.Value).ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeBoolean)) ), new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/hasSunglasses")), obj: _nodeFactory.CreateLiteralNode(Convert.ToInt32(mainFace.Sunglasses.Value).ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeBoolean)) ), new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/isFeeling")), obj: _nodeFactory.CreateLiteralNode(mainFace.Emotions.OrderByDescending(emotion => emotion.Confidence).First().Type.ToString().ToLower(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeString)) ) }); // image instance has scene instance triples.Add(new Triple( subj: imageNode, pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/hasScene")), obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + selfieDetail.ImageName)) )); // scene instance is of type Scene class triples.Add(new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")), obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene")) )); // filling scence attributes foreach (var label in selfieDetail.Labels) { triples.Add(new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + selfieDetail.ImageName)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/isDescribedBy")), obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + label.Name)) )); foreach (var parentLabel in label.Parents) { triples.Add(new Triple( subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + label.Name)), pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/hasParent")), obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + parentLabel.Name)) )); } } // // updated triples in graph // try { _blazegraph.UpdateGraph(UriFactory.Create(SELFIES_GRAPH), triples, new List <Triple>()); context.Logger.LogLine("Updated triples successfully."); } catch (Exception ex) { context.Logger.LogLine(ex.Message); context.Logger.LogLine(ex.InnerException.Message); return; } } } } catch (AmazonS3Exception ex) { context.Logger.LogLine(ex.Message); } } }
/// <summary> /// Decodes an Object into an appropriate Node /// </summary> /// <param name="factory">Node Factory to use to create Node</param> /// <param name="n">Object to convert</param> /// <returns></returns> private INode LoadNode(INodeFactory factory, Object n) { INode temp; if (n is SqlExtendedString) { SqlExtendedString iri = (SqlExtendedString)n; if (iri.IriType == SqlExtendedStringType.BNODE) { //Blank Node temp = factory.CreateBlankNode(n.ToString().Substring(9)); } else if (iri.IriType != iri.StrType) { //Literal temp = factory.CreateLiteralNode(n.ToString()); } else if (iri.IriType == SqlExtendedStringType.IRI) { //Uri Uri u = new Uri(n.ToString(), UriKind.RelativeOrAbsolute); if (!u.IsAbsoluteUri) { throw new RdfParseException("Virtuoso returned a URI Node which has a relative URI, unable to resolve the URI for this node"); } temp = factory.CreateUriNode(u); } else { //Assume a Literal temp = factory.CreateLiteralNode(n.ToString()); } } else if (n is SqlRdfBox) { SqlRdfBox lit = (SqlRdfBox)n; if (lit.StrLang != null) { //Language Specified Literal temp = factory.CreateLiteralNode(n.ToString(), lit.StrLang); } else if (lit.StrType != null) { //Data Typed Literal temp = factory.CreateLiteralNode(n.ToString(), new Uri(lit.StrType)); } else { //Literal temp = factory.CreateLiteralNode(n.ToString()); } } else if (n is String) { String s = n.ToString(); if (s.StartsWith("nodeID://")) { //Blank Node temp = factory.CreateBlankNode(s.Substring(9)); } else { //Literal temp = factory.CreateLiteralNode(s); } } else if (n is Int32) { temp = ((Int32)n).ToLiteral(factory); } else if (n is Int16) { temp = ((Int16)n).ToLiteral(factory); } else if (n is Single) { temp = ((Single)n).ToLiteral(factory); } else if (n is Double) { temp = ((Double)n).ToLiteral(factory); } else if (n is Decimal) { temp = ((Decimal)n).ToLiteral(factory); } else if (n is DateTime) { temp = ((DateTime)n).ToLiteral(factory); } else if (n is TimeSpan) { temp = ((TimeSpan)n).ToLiteral(factory); } else if (n is Boolean) { temp = ((Boolean)n).ToLiteral(factory); } else if (n is DBNull) { //Fix by Alexander Sidarov for Virtuoso's results for unbound variables in OPTIONALs temp = null; } else { throw new RdfStorageException("Unexpected Object Type '" + n.GetType().ToString() + "' returned from SPASQL SELECT query to the Virtuoso Quad Store"); } return temp; }