我想修改一個使用dotNetRDF的Rdf節點,然後將它保存在一個新文件中,但我得到的是同一個文件!替換節點DotnetRDF
我想將標識/ 12更改爲標識/ 18。
模板文件:
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
@prefix qudt: <http://qudt.org/schema/qudt#>.
@prefix qudt-unit: <http://qudt.org/vocab/unit#>.
@prefix knr: <http://kurl.org/NET/knr#>.
@prefix keak: <http://kurl.org/NET/keak#>.
@prefix keak-time: <http://kurl.org/NET/keak/time#>.
@prefix keak-eval: <http://kurl.org/NET/keak/eval#>.
@prefix keak-quantity: <http://kurl.org/NET/keak/quantity#>.
@prefix keak-ev: <http://kurl.org/NET/keak/ev#>.
@base <http://data.info/keak/knr/>.
<Identification/12> a keak-ev:Identification.
<Quantity/45> a qudt:Quantity ;
qudt:quantityType keak-quantity:ElectricConsumption .
的VB.NET代碼:
Dim gKnr As IGraph = New Graph()
Dim ttlParser As TurtleParser = New TurtleParser()
'Load the file template
ttlParser.Load(gKnr, PATH_TEMPLATE)
gKnr.BaseUri = New Uri(keak_BASE_URI_Knr)
Dim oNode As INode = gKnr.CreateUriNode(New Uri("http://kurl.org/NET/keak/ev#Identification"))
'retrieve the item
Dim listRes As List(Of Triple) = gKnr.GetTriplesWithObject(oNode)
'?s = http://data.info/keak/Knr/Identification/12 ,
'?p = http://www.w3.org/1999/02/22-rdf-syntax-ns#type ,
'?o = http://kurl.org/NET/keak/ev#Identification
'modify the item
Dim tIdentification As Triple
If listRes.Count = 1 Then
tIdentification = listRes(0)
tIdentification.Subject.GraphUri = New Uri("http://data.info/kseak/knr/Identification/18")
End If
gKnr.Assert(tIdentification)
' Serialisation and Save
Dim ttlWriter As New CompressingTurtleWriter()
ttlWriter.DefaultNamespaces = gKnr.NamespaceMap
ttlWriter.Save(gKnr, PATH_NEW_FILE)