question on advanced features rule example and SHACL API implementation

[Felix Sasaki]

Hi all,

I am trying the SHACL rule example from

https://www.w3.org/TR/shacl-af/#rules-examples

with the SHACL API from 

https://github.com/TopQuadrant/shacl

Version 1.3.2. 

With the attached file, I get the following error message:

"Exception in thread "main" org.apache.jena.query.QueryParseException: Line 3, column 39: Unresolved prefixed name: ex:area"

Is this a bug in the SPARQL implementation, or is the example from the spec wrong?

Unrelated to this specific feature: I tried to install the latest version of the SHACL API and then get an error 

"org/topbraid/shacl/tools/Infer has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0"

I am using on mac os x the latest JRE from Oracle

Java(TM) SE Runtime Environment (build 1.8.0_311-b11)

Java HotSpot(TM) 64-Bit Server VM (build 25.311-b11, mixed mode)

Is there a way to work with the latest SHACL API, maybe by working with a different JRE?

Regards

Felix

[Holger Knublauch]

On 2021-11-15 4:56 am, 'Felix Sasaki' via TopBraid Suite Users wrote:

Hi all,

I am trying the SHACL rule example from

https://www.w3.org/TR/shacl-af/#rules-examples

with the SHACL API from 

https://github.com/TopQuadrant/shacl

Version 1.3.2. 

With the attached file, I get the following error message:

"Exception in thread "main" org.apache.jena.query.QueryParseException: Line 3, column 39: Unresolved prefixed name: ex:area"

Is this a bug in the SPARQL implementation, or is the example from the spec wrong?

The example as printed in the spec is incomplete, because it does not sh:declare the prefix.

To make it complete, either

add

ex:
    sh:declare [
        sh:prefix "ex" ;
        sh:namespace "http://example.com/ns#"^^xsd:anyURI ;
    ] .

or put the prefix into the beginning of the query string and delete the sh:prefixes link:

sh:construct """
    PREFIX ex: "http://example.com/ns#"
    CONSTRUCT ...

See https://www.w3.org/TR/shacl/#sparql-prefixes for the general topic.

Unrelated to this specific feature: I tried to install the latest version of the SHACL API and then get an error 

"org/topbraid/shacl/tools/Infer has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0"

I am using on mac os x the latest JRE from Oracle

Java(TM) SE Runtime Environment (build 1.8.0_311-b11)

Java HotSpot(TM) 64-Bit Server VM (build 25.311-b11, mixed mode)

Is there a way to work with the latest SHACL API, maybe by working with a different JRE?

Yes, you need to upgrade your Java version because the Jena API that we use requires Java 11.

https://openjdk.java.net/projects/jdk/11/

HTH
Holger

Regards

Felix

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