[UI] SPARQL Support in User-Interfaces

[edmondchuc]

Should we consider SPARQL for user-interfaces at all? Do shapes provide enough querying capability to not need SPARQL?

Do we need a section on SPARQL Update to describe how edits are applied to forms?

Links:

• SPARQL 1.2 Query Language
• SPARQL 1.2 Update

[edmondchuc]

Some initial comments on this topic by Thomas Francart. #523 (comment)

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We do use SPARQL for example to populate dropdown lists. Dropdown lists can be populated by a default algorithm that would list all targets of the sh:node shapes, with their labels taken from the property marked with dash:propertyRole dash:LabelRole. However there are a lot of cases where we want to customise the content of the dropdown box. We use SPARQL for this, but this could now be possible with node expressions, I guess ? but we do have fairly complex SPARQL queries, I am not sure the expressivity of node expressions will be sufficient (?)

[edmondchuc]

Comment by @HolgerKnublauch in #523 (comment)

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We use SPARQL for this, but this could now be possible with node expressions, I guess ? but we do have fairly complex SPARQL queries, I am not sure the expressivity of node expressions will be sufficient (?)

Yes, using https://www.w3.org/TR/shacl12-sparql/#SelectExpression :)