Allow INSERT instruction

[StephaneBranly]

Would be nice to have the possibility to insert data using a notebook.

[BenjaminHofstetter]

@StephaneBranly this is necessary. Can you help me shape this feature?

What triple store do you use? Do you have a separate SPARQL endpoint for inserts (updates)?

[BenjaminHofstetter]

Some thoughts on this feature:

• Some stores have different update endpoints.
• We can define a “Server Connection” with two endpoints: one for reads and one for writes. The notebook can detect writes and choose the endpoint accordingly.
• Should we bind a Cell to an Endpoint, like “use this connection for this cell”? This isn’t portable because different users may have different connection names. But we can check the URL.
• SPARQL on Turtle files: I need to verify that the Writes operations work with Oxigraph. I don’t think it’s a significant concern. However, I’m curious about when we should write the changes back to the Turtle file.

[StephaneBranly]

@StephaneBranly this is necessary. Can you help me shape this feature?

What triple store do you use? Do you have a separate SPARQL endpoint for inserts (updates)?

We are using an Apache Jena instance. There are 2 different endpoints (by default), one for reads and an other for writes.

Some thoughts on this feature:

* Some stores have different update endpoints.

* We can define a “Server Connection” with two endpoints: one for reads and one for writes. The notebook can detect writes and choose the endpoint accordingly.

* Should we bind a Cell to an Endpoint, like “use this connection for this cell”? This isn’t portable because different users may have different connection names. But we can check the URL.

* SPARQL on Turtle files: I need to verify that the Writes operations work with Oxigraph. I don’t think it’s a significant concern. However, I’m curious about when we should write the changes back to the Turtle file.

I also suggest to save in the notebook the used endpoints (without credientials) as a config. This should simplify the third point.