Nanopub templates: support datatype literals

Ostrzyciel commented 2 months ago

I may be wrong here, but as far as I understand, there is currently no way to specify a placeholder in a Nanopub template that would correspond to a datatype literal (e.g., a literal with type xsd:int). When I use the "Literal placeholder" type and put (for example) "2024-08-14"^^xsd:date in the template, the entire thing (including the quotes and the datatype annotation) is used as the lexical value of the literal. When I use the "URI/literal placeholder" type and do the same, I get an "invalid literal value" error:

So, I have no way of obtaining a triple like _:s _:p "2024-08-14"^^xsd:date.

What I think would be perfect for this:

Have a new placeholder type: DatatypeLiteralPlaceholder, a subclass of LiteralPlaceholder
Specify the datatype for the placeholder in the Nanopub template (e.g., xsd:date). For this probably a new property in the template vocabulary would be needed.
Optional: in Nanodash's validation code implement checks for common datatypes (e.g., xsd:date, xsd:int) to make sure the values inputted by the user are valid for this datatype. This theoretically could also be done with hasRegex, but then each template creator would have to come up with their own regexes for datatypes (assuming one could even express this using a regex... well, we don't need to be perfect).

Mockup of how the user would see this:

Note that this proposal is based on the understanding that there is no other way to have datatype literals in Nanodash.

tkuhn commented 2 months ago

Yes, exactly, that is what I plan to do, but it's not yet implemented. There is this other ticket about this too: https://github.com/knowledgepixels/nanodash/issues/14

It would then also be good to have a nice date picker for dates, and possibly other GUI elements for the other datatypes.

Is this something you would need urgently? I cannot promise too much, but I can give it higher priority.

Ostrzyciel commented 2 months ago

Thank you for the quick reply!

Not really needed urgently... I can kind of manage without it for now.

knowledgepixels / nanodash

Nanopub templates: support datatype literals #152