Constraint vocabularies

[bcogrel]

Hydra: http://hydra-cg.com/spec/latest/core/

Resource Shapes 2.0: http://www.w3.org/Submission/shapes/ (also see http://www.w3.org/Submission/2014/01/Comment/)

SPIN constraints and templates: http://spinrdf.org/spin.html#spin-constraints
SPIN-based constraint ontology: http://semwebquality.org/ontologies/dq-constraints

Dublin Core Description Set Profiles: http://dublincore.org/documents/dc-dsp/

[bcogrel]

CubicWeb-specific constraints. RQL-Based constraints are common so SPIN should be seriously considered.

Equivalent of RQL keywords TODAY and NOW:

now() is a SPARQL function. From now(), today information can be extracted http://answers.semanticweb.com/questions/15434/getting-days-of-the-week-from-datetime-in-sparql

[bcogrel]

String size: STRLEN SPARQL function http://www.w3.org/TR/sparql11-query/#func-strlen .

For string max size, a SPIN template should be used (may already exist).

[bcogrel]

A new promising language, under specification: ShEX Shape Expressions https://www.w3.org/2001/sw/wiki/ShEx .

"ShEX, or Shape Expressions, is a language for expressing constraints on RDF graphs. It includes the cardinality constraints from OSLC Resource Shapes and Dublin Core Description Set Profiles as well as logical connectives for disjuntion and polymorphism. It is intended to:

• validate RDF documents.
• communicate expected graph patterns for interfaces.
• generate user interface forms and interface code.
• compile to SPARQL queries (except for cyclic grammars)."

Indicated by Markus Lanthaler: http://lists.w3.org/Archives/Public/public-hydra/2014Jun/0099.html

[bcogrel]

New working group at W3C: Data Shapes http://www.w3.org/blog/data/2014/09/30/data-shapes-working-group-launched/

[bcogrel]

In Symfony: http://symfony.com/doc/current/book/validation.html#supported-constraints