Unable to generate PREFIXes

[rubensworks]

When doing something like this: const query = new SparqlGenerator().generate(parsedQuery, { prefixes: this.options.prefixes });,
the resulting query string does not include these prefixes.

Once fixed, this hack can be removed from our web client: comunica/jQuery-Widget.js@eddc68f

[jitsedesmet]

@rubensworks I think this prefixes context item should just not be supported? I think it makes much more sense to see this as an AST manipulation?

[jitsedesmet]

I just saw that the contextType should not even accept such prefixes?

[rubensworks]

It existed in SPARQL.js, so it would be valuable for it to be supported here as well.

[jitsedesmet]

It would still exist, but much more on the level of the AST and it's manipulation, which makes way more sense. Remember that Traqula ended up diverging quite a bit from SPARQL.js. Only the Algebra has remained stable. The AST of SPARQL.js was a bigger mess (introducing round tripping on top of it would have been even harder).

[jitsedesmet]

Introducing the prefixes through the AST would not be hard either. I am currently writing the documentation on AST manipulation. You can expect it in the coming days.