Sparql interface

[jjkoehorst]

This is a mock-up example mostly helped with Claude as it is something I think is important for SEEK but found it easier to explain by showing what I mean with it I am in no means a seek / ruby backend expert so don't blindly accept this commit ;).

It's "just" another button that brings you to the SEEK sparql endpoint interface that connects with the virtuoso public endpoint (if I did it correctly) as the virtuoso sparql interface is simply horrible.

There are some dummy example queries ( I am now working on the population script to see what ends up in the endpoint but have not got that part working yet....)

It would be great if the query field has some SPARQL syntax knowledge. it currently supports table, json and xml output formats.
Also the links point directly to where they are pointing to. It would be nice if on click it could fire a describe query and a special click (maybe link button) brings them to the link destination. This way people can more easily "browse" the endpoint.

Once populated it would also need a endpoint map UML like to show the structure but that's for later...

[stuzart]

some refactoring needed, and tests.
Bit confused about the help_documents/index.html, which looks like a cleaner and updated version of what is in sparql/index.html but in the wrong place ??

Occurred to me whilst reviewing, that shoudl probably avoid using virtuoso specifically, as there is the ability implement other subclasses of RdfRepository to support other triple stores

[jjkoehorst]

Some new changes based on feedback from @stuzart , working on "tests". I also have another change in the pipeline that has to do with RDF. basically for institutions there is no RDF yet

institutions_controller.rb

      format.rdf { render template: 'rdf/show' }
      format.ttl { render template: 'rdf/show' }

in institution.rb
include Seek::Rdf::RdfGeneration

and the jerm_vocab

Institution => 'https://schema.org/Organization',

which should enable RDF for institutions. shall I push it to this branch as well?

[Copilot]

Pull Request Overview

This PR introduces a SPARQL query interface for SEEK to provide a user-friendly web interface for querying the RDF knowledge graph. The interface replaces the default Virtuoso SPARQL interface with a custom Rails-based solution that supports multiple output formats and includes example queries.

• Adds a complete SPARQL controller with query execution and error handling
• Implements responsive web interface with example queries and filtering
• Includes comprehensive test coverage for both functional and integration scenarios

Reviewed Changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
app/controllers/sparql_controller.rb	Main controller handling SPARQL query execution and responses
app/views/sparql/*.html.erb	View templates for the SPARQL interface and results display
app/assets/stylesheets/sparql.scss	Styling for the SPARQL interface components
app/assets/javascripts/sparql.js	Client-side functionality for query interaction and filtering
test/integration/sparql_controller_test.rb	Integration tests for SPARQL functionality
test/functional/sparql_controller_test.rb	Functional tests for controller behavior
lib/seek/rdf/rdf_repository.rb	Added availability check method for RDF repository
config/sparql_queries.yml	Example SPARQL queries configuration
config/routes.rb	Added SPARQL routes
app/views/layouts/navbar/_navbar.html.erb	Added SPARQL link to navigation

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}