Use of magic properties in EDG

[Steve Ray]

Hi, I defined a magic property to infer values for a class relation,
which works fine in SPARQL queries. I was wondering if there is a way
for these inferred properties to be displayed in EDG without
explicitly asserting them with, say, sh:value? I'm trying not to
clutter up our vocabulary with things that can be inferred.

How do spin Magic Properties migrate over to the EDG world?


Steve

[Holger Knublauch]

Older versions of our forms did show magic properties automatically but
this is no longer the case.

I had added sh:values rules to SHACL-AF as a substitute for magic
properties in mind. Magic properties are a SPARQL-specific feature that
offers a bit too much flexibility while sh:values rules cover the common
use cases of computing values for a given focus node.

Note that sh:values rules can even be chained together (using sh:path
expressions), and work on the forms, GraphQL and the (new) Active Data
Shapes scripts. And if the expressiveness of the built-in node
expressions isn't sufficient, you can literally wrap the SPARQL query
from your magic property as in

    https://w3c.github.io/shacl/shacl-af/#select

Note that magic properties can accept multiple "arguments" and compute
multiple "results" (on both left and right hand side) while sh:values
rules always just take one argument and produce one result variable.
This variable may have multiple rows though.

Holger

[Steve Ray]

Thanks, Holger. My magic property is recursive, and yields multiple
values on the right side, so I will see if I can get the (recursive)
SPARQL query wrapped into a sh:values clause.


Steve

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