Support Skolemization of blank nodes

[abrokenjester]

(Migrated from https://openrdf.atlassian.net/browse/SES-1858)

Skolemization of blank nodes is being standardised as part of RDF-1.1.

We should support this somewhere in the OpenRDF API to enable users to transparently map skolemized blank node IRIs back to blank nodes and vice versa as necessary.

http://www.w3.org/TR/rdf11-concepts/#section-skolemization

[barthanssens]

Should this be a setting, e.g. RioSetting BasicParserSettings.SKOLEMIZE_BASE and/or a Models method ?

Something along the lines of Models.skolemize(Model m, String base) and Models.deskolemize(Model m)
Where the skolemized IRI would become base + "/.well-known/genid/" + UUID.randomUUID() + "/" + bnode.getID() ?

[seralf]

Hi I wonder if there were news about this implementation?

[catch-point]

No development has yet to be made on this AFAIK. Are you interested in helping out?

[seralf]

yes, it would be very helpful to introduce well-know uri. 2017-12-08 21:22 GMT+01:00 James Leigh <notifications@github.com>:

…

No development has yet to be made on this AFAIK. Are you interested in helping out? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#438 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAFYfM_pibA6QvpN0jdN4ESBbYKQoxADks5s-ZpqgaJpZM4J2akH> .

[catch-point]

@seralf can you take a look at the PR and let me know if that will work for your use case.

[seralf]

Hi @jamesrdf sorry for slow replies, I wasn't able to look at it yet!
I'm not sure if I correctly understand the implication of this change: could it be used as a base for providing custom ways to create well-known id for blanknodes maybe?

[catch-point]

It provides a parser setting of the scheme+authority used to skolemize the blanks nodes that are parsed. What is your use case?