SHACL RDF parser

[labra]

Add support for SHACL RDF reader syntax.

SHACL features based on: SHACL recommendation

Target selection

• sh:targetNode
• sh:targetClass
• Implicit class targets
• sh:targetSubjectsOf
• sh:targetObjectsOf

Shapes

• sh:name
• sh:description
• sh:group
• sh:order
• owl:imports
• sh:entailment
• sh:shapesGraph

Validation report

• sh:deactivated
• sh:message
• sh:severity

Constraints

• Node constraints
• Property shapes (sh:path)
• Path constraints

Constraint components

• sh:class
• sh:datatype
• sh:nodeKind
• sh:minCount
• sh:maxCount
• sh:minInclusive, sh:maxInclusive, sh:minExclusive, sh:maxExclusive
• sh:minLength
• sh:maxLength
• sh:pattern
• sh:flags
• sh:languageIn
• sh:uniqueLang
• sh:equals
• sh:disjoint
• sh:lessThan
• sh:lessThanOrEquals
• sh:not
• sh:and
• sh:or
• sh:xone
• sh:node
• sh:qualifiedValueshape, qualifiedMinCount, qualifiedMaxCount
• sh:qualifiedValueshapesDisjoint
• sh:closed
• sh:ignoredProperties
• sh:hasValue
• sh:in

SPARQL based constraints

Not yet supported

[labra]

We created a first version of the RDF parser using the concept of RDF parser combinators inspired by the combine.

It works but simple cases, but it fails with nested ors at this moment. I am thinking to refactor it following a more modern approach inspired by winnow.