ISSUE-141: How to represent mixed datatype-or-class ranges

Mixed ranges

How to represent mixed datatype-or-class ranges

State:

CLOSED

Product:

SHACL - Core

Raised by:

Holger Knublauch

Opened on:

2016-03-22

Description:

Some ontologies contain properties that can either take literals or resources. Example: http://schema.org/address takes either xsd:string or schema:PostalAddress. I believe many DC properties are frequently used with mixed values. RDF has rdf:Property, only OWL separates datatype and object properties.

The current syntax to represent those in SHACL Core is terrible:

schema:AddressShape
a sh:Shape ;
sh:constraint [
sh:or (
[ sh:property [ sh:predicate schema:address ; sh:datatype xsd:string ] ]
[ sh:property [ sh:predicate schema:address ; sh:class schema:PostalAddress ] ]
)
] .

Some options:

0) Do nothing, consider this a rare (anti) pattern.

1) Change sh:class and sh:datatype so that they only apply to resources or literals, respectively. Using a literal with sh:class would no longer be a violation. sh:nodeKind would have to be used for most other properties:

schema:AddressShape
a sh:Shape ;
sh:property [
sh:predicate schema:address ;
sh:datatype xsd:string ;
sh:class schema:PostalAddress ;
] .

2) Improve syntax of sh:or (and sh:and) to allow for property constraints:

schema:AddressShape
a sh:Shape ;
sh:property [
sh:predicate schema:address ;
sh:or (
[ sh:datatype xsd:string ]
[ sh:class schema:PostalAddress ]
)
] .

(The values of the list would be sh:PropertyConstraints that use the same sh:predicate from the surrounding property constraint.)

A follow-up of 2) would be that we could drop sh:classIn and sh:datatypeIn to avoid too many syntaxes for the same thing.

Related Actions Items:

No related actions

Related emails:

1. Re: RDF Data Shapes WG agenda for 27 July 2016 (from holger@topquadrant.com on 2016-07-28)
2. Re: List of open SHACL Core Syntax ISSUEs (from holger@topquadrant.com on 2016-07-14)
3. Re: List of open SHACL Core Syntax ISSUEs (from kontokostas@informatik.uni-leipzig.de on 2016-07-14)
4. List of open SHACL Core Syntax ISSUEs (from holger@topquadrant.com on 2016-07-12)
5. Re: RDF Data Shapes WG agenda for 26 May 2016 (from holger@topquadrant.com on 2016-05-26)
6. regrets and votes for RDF Data Shapes WG 5 May 2016 meeting (from eric@w3.org on 2016-05-05)
7. Re: ISSUE-141: Proposal for sh:type (from holger@topquadrant.com on 2016-05-02)
8. Re: ISSUE-141: Proposal for sh:type (from pfpschneider@gmail.com on 2016-04-29)
9. Re: ISSUE-141: Proposal for sh:type (from holger@topquadrant.com on 2016-04-29)
10. Re: ISSUE-141: Proposal for sh:type (from pfpschneider@gmail.com on 2016-04-29)
11. ISSUE-141: Proposal for sh:type (from holger@topquadrant.com on 2016-04-29)
12. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from holger@topquadrant.com on 2016-04-14)
13. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from kcoyle@kcoyle.net on 2016-04-13)
14. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from holger@topquadrant.com on 2016-04-12)
15. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from holger@topquadrant.com on 2016-04-12)
16. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from holger@topquadrant.com on 2016-04-12)
17. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from pfpschneider@gmail.com on 2016-04-11)
18. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from pfpschneider@gmail.com on 2016-04-11)
19. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from pfpschneider@gmail.com on 2016-04-11)
20. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from holger@topquadrant.com on 2016-03-30)
21. Re: shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from pfpschneider@gmail.com on 2016-03-28)
22. schema.org and SHACL (from holger@topquadrant.com on 2016-03-25)
23. shapes-ISSUE-141 (Mixed ranges): How to represent mixed datatype-or-class ranges [SHACL - Core] (from sysbot+tracker@w3.org on 2016-03-22)

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