ACTION: ericP to send proposal for sh:Stem in response to ISSUE-80

Oops, forgot about this action.

In general, stems look like this in ShExC:

<http://a.example/S1> {
   <http://a.example/p1> [<http://a.example/v>~]
}

this in ShExJ:

{
  "type": "Schema",
  "prefixes": {},
  "shapes":{
    "http://a.example/S1": {
      "type": "Shape",
      "expression": {
        "type": "TripleConstraint",
        "predicate": "http://a.example/p1",
        "valueExpr": {
          "type": "ValueClass", "values": [
            { "type": "StemRange",
              "stem": "http://a.example/v"
            }
          ]
        }
      }
    }
  }
}

and this in RDF:

[ a shex:Schema ;
  shex:shape <http://a.example/S1> ] .

<http://a.example/S1>
  a shex:Shape ;
  shex:expression [
    a shex:TripleConstraint ;
    shex:predicate <http://a.example/p1> ;
    shex:valueExpr [
      a shex:ValueClass ;
      shex:values [
        a shex:StemRange ;
        shex:stem <http://a.example/v>
      ]
    ]
  ] .
    
We also have stem (- stem)* a la

<http://a.example/S1> {
   <http://a.example/p1> [<http://a.example/v>~
                          - <http://a.example/v1>~
                          - <http://a.example/v2>~
                          - <http://a.example/v3>~]
}

and

{
  "type": "Schema",
  "prefixes": {},
  "shapes":{
    "http://a.example/S1": {
      "type": "Shape",
      "expression": {
        "type": "TripleConstraint",
        "predicate": "http://a.example/p1",
        "valueExpr": {
          "type": "ValueClass", "values": [
            { "type": "StemRange",
              "stem": "http://a.example/v",
              "exclusions": [
                { "type": "Stem", "stem": "http://a.example/v1"},
                { "type": "Stem", "stem": "http://a.example/v2"},
                { "type": "Stem", "stem": "http://a.example/v3"}
              ]
            }
          ]
        }
      }
    }
  }
}

You can find the stem tests in <http://raw.githubusercontent.com/shexSpec/shexTest/master/validation/manifest.ttl> with

  SELECT * { ?s <http://www.w3.org/ns/shacl/test-suite#trait> <http://www.w3.org/ns/shacl/test-suite#Stem> }

Gotta put my child to bed. will try to write to formalize later.
-- 
-ericP

office: +1.617.599.3509
mobile: +33.6.80.80.35.59

(eric@w3.org)
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Received on Wednesday, 9 March 2016 20:01:26 UTC