Re: [dotNetRDF-Support] A question about Graph.GetUriNode

[Rob V. <rv...@do...>]

Hi Jerin

There is a key difference between GetUriNode() and CreateUriNode() which I
guess is not as clearly explained as it might be in the documentation.  It
is mentioned in [1] under the Selecting Nodes section but not explicitly
called out in the intellisense documentation

The difference is that GetUriNode() retrieves a Node only if it appears in
the Graph and returns null otherwise.

Whereas CreateUriNode() creates a new node associated with that Graph and
always gives a value (or in the case of a malformed Qname used to create a
URI an exception)

We'll adjust the documentation appropriately to make this clearer

Thanks,

Rob Vesse

From:  堆烟・雷云纹（Jerin Lee） <jer...@ya...>
Reply-To:  堆烟・雷云纹（Jerin Lee） <jer...@ya...>, dotNetRDF User
Help and Support <dot...@li...>
Date:  Thursday, May 31, 2012 11:01 PM
To:  "dot...@li..."
<dot...@li...>
Subject:  [dotNetRDF-Support] A question about Graph.GetUriNode

> Hi, Guys.
> I love the framework very much! But now I'm confused about the method:
> Graph.GetUriNode.
> The turtle content is at the bottom of this letter.
> In my code:
> INode nodeConcept = g.GetUriNode( new Uri(
> "http://www.chuci.info/schema/synonymset#Concept") );
> INode nodeUri = g.GetUriNode( new Uri(
> "http://www.chuci.info/schema/synonymset#uri" ) );
> 
> The first variable nodeConcept is right, but nodeUri is always null :(
> I add the following code, I don't know why, but it works well finally.
> if(nodeUri == null)
>           nodeUri = g.CreateUriNode( new Uri(
> "http://www.chuci.info/schema/synonymset#uri") );
> 
> In normal sense GetUriNode  should work, but instead CreateUriNode works
> correctly.
> I tried but  found nothing helpful at dotnetrdf.org, so I write this letter.
> 
> [Turtle Content]
> 
> @base <http://www.chuci.info/schema/synonymset#>.
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
> @prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
> @prefix ss: <http://www.chuci.info/schema/synonymset#>.
> 
> ss:Concept ss:id "e31c44b7f8994d399865d8c315b77daa";
>            ss:name "gender"@en-us,
>                    "性别"@zh-cn;
>            ss:uri <http://schema.org/gender>,
>                   <http://xmlns.com/foaf/0.1/gender>.
> 
> 
> Waiting your answer!
> Thank you very much!
> Jerin
> 2012-6-1
>  
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