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https://issues.apache.org/jira/browse/JENA-2034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17284252#comment-17284252
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Calum Mackervoy commented on JENA-2034:
---------------------------------------
Thanks I looked into this but I think I need the Formula feature from N3
because I need to refer to the named graph as a property on my resource?
To start at the beginning the Resource I have is a `Task`, it's an extension of
`time:Interval` (hasBeginning, hasEnd) which needs also a property `endState`
(a resource of type `solid:Patch`), i.e.
```
{{@prefix solid: <http://www.w3.org/ns/solid/terms#>.}}
{{@prefix log: <http://www.w3.org/2000/10/swap/log#>.}}
{{@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.}}
{{[}}
{{ }}a solid:Patch;
solid:patches rdfs:Resource;
solid:deletes log:Formula;
solid:inserts log:Formula
].
```
I see how `solid:deletes` and `solid:inserts` can be made into named graphs but
not how they can be referenced as a property on a Resource ?
> adding GraphNode (N3 formula) to Model (ARQInternalErrorException)
> ------------------------------------------------------------------
>
> Key: JENA-2034
> URL: https://issues.apache.org/jira/browse/JENA-2034
> Project: Apache Jena
> Issue Type: Question
> Components: ARQ, Jena, RDF API
> Affects Versions: Jena 3.17.0
> Environment: * Ubuntu 20.04
> * Using Eclipse EE
> * Project is running a Tomcat 9 server
> Reporter: Calum Mackervoy
> Priority: Minor
>
> I'm attempting to add a Graph node to a Model (N3 formula)
> The output should be roughly like the below:
> ```
> <http://localhost:8080/patches/#cf0ba48fa8b0421c8b025c3ea6b41a4f>
> a <http://www.w3.org/ns/solid/terms#Patch> ;
> <http://www.w3.org/ns/solid/terms#patches>
> <http://example.com/#me> ;
> <http://www.w3.org/ns/solid/terms#inserts> \{ http://example.com/#me
> http://example.com/#property http://example.com/#resource } .
> ```
> Note that the `#inserts` property here is a "GraphNode" or N3 formula, I'm
> modelling a graph of the triples to write when a `Task` is complete
> I tried the code below:
> ```
> Model out = ModelFactory.createDefaultModel();
> out.add(endState, SolidTerms.inserts,
> out.asRDFNode(NodeFactory.createGraphNode(inserts.getGraph())));
> ```
> but this throws `[org.apache.jena.sparql.ARQInternalErrorException: Unknown
> node type: \{http://example.com/#me @http://example.com/#property
> http://example.com/#resource}]`
> I've tried many other ways of putting the `Graph` in the model with no
> success, posting this one because it was my first and I think the most
> rational. I think it's a bug unless Jena just doesn't support the GraphNode
> type in `RDFNode` ? I spent a few hours searching the documentation and the
> web before opening this issue
> The `@` in the error output puzzled me a bit, but I checked that it's not
> included in my property definition, it's maybe added in by the
> `createGraphNode` or the error serialization
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