extract-cbd-shape-ap.ttl

## This is an application profile for what the Extract CBD Shape algorithm expects for a shape
##
## Adapted from https://www.w3.org/TR/shacl/#shacl-shacl
##
@prefix :  <https://raw.githubusercontent.com/pietercolpaert/extract-cbd-shape/main/extract-cbd-shape-ap.ttl#> .
@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sh:   <http://www.w3.org/ns/shacl#> .
@prefix xsd:  <http://www.w3.org/2001/XMLSchema#> .
@prefix shsh: <http://www.w3.org/ns/shacl-shacl#> .

<> rdfs:label "SHACL shape for the shape expected by the Extract CBD Shape algorithm"@en ;
   rdfs:description "Adapted from <http://www.w3.org/ns/shacl-shacl>"@en .

:ShapeShape
	a sh:NodeShape ;
	rdfs:label "Shape shape"@en ;
	rdfs:comment "A shape that can be used to CBD extract SHACL shapes."@en ;
	# Shapes are either node shapes or property shapes
	sh:xone ( :NodeShapeShape :PropertyShapeShape ) .
	
:NodeShapeShape
	a sh:NodeShape ;
    ### We expect a sh:property to always refer to a property shape. In case it doesn’t it’s because it will have conditionals.
    sh:xone ( 
        [
		    sh:path sh:property;
		    sh:node :PropertyShapeShape ;
            sh:minCount 1
	    ] 
        [
		    sh:path sh:and ;
		    sh:node :ShapesListShape ;        # and-node
            sh:minCount 1
	    ]
	    [
		    sh:path sh:or ;
		    sh:node :ShapesListShape ;        # or-node
            sh:minCount 1
	    ]
	    [
		    sh:path sh:xone ;
		    sh:node :ShapesListShape ;        # xone-node
            sh:minCount 1
	    ]
     ) .
    
:PropertyShapeShape
	a sh:NodeShape ;
	sh:property [
		sh:path sh:path ;
		sh:maxCount 1 ;                 # path-maxCount
		sh:minCount 1 ;                 # PropertyShape-path-minCount
		sh:node shsh:PathShape ;        # path-node
	] ;
    # We added this to indicate that a property will refer to a NodeShape through sh:node
    sh:property [
        sh:path sh:node ;
        sh:node :NodeShapeShape ;
    ].

# Values of sh:and, sh:or and sh:xone must be lists of shapes
:ShapesListShape
	a sh:NodeShape ;
	sh:property [
		sh:path ( [ sh:zeroOrMorePath rdf:rest ] rdf:first ) ;
        sh:minCount 1 ;
		sh:node :ShapeShape ;
	] .

### Bellow included for convenience: reused as-is from SHACL SHACL

shsh:ListShape
	a sh:NodeShape ;
	rdfs:label "List shape"@en ;
	rdfs:comment "A shape describing well-formed RDF lists. Currently does not check for non-recursion. This could be expressed using SHACL-SPARQL."@en ;
	rdfs:seeAlso <https://www.w3.org/TR/shacl/#syntax-rule-SHACL-list> ;
	sh:property [
		sh:path [ sh:zeroOrMorePath rdf:rest ] ;
		rdfs:comment "Each list member (including this node) must be have the shape shsh:ListNodeShape."@en ;
		sh:hasValue rdf:nil ;
		sh:node shsh:ListNodeShape ;
	] .

## Included for convenience - see shacl-shacl
shsh:ListNodeShape
	a sh:NodeShape ;
	rdfs:label "List node shape"@en ;
	rdfs:comment "Defines constraints on what it means for a node to be a node within a well-formed RDF list. Note that this does not check whether the rdf:rest items are also well-formed lists as this would lead to unsupported recursion."@en ;
	sh:xone ( [
				sh:hasValue rdf:nil ;
        		sh:property [
					sh:path rdf:first ;
					sh:maxCount 0 ;
				] ;
				sh:property [
					sh:path rdf:rest ;
					sh:maxCount 0 ;
				] ;
			]
			[
				sh:not [ sh:hasValue rdf:nil ] ;
				sh:property [
					sh:path rdf:first ;
					sh:maxCount 1 ;
					sh:minCount 1 ;
				] ;
				sh:property [
					sh:path rdf:rest ;
					sh:maxCount 1 ;
					sh:minCount 1 ;
				] ;
			] ) .

# A path of blank node path syntax, used to simulate recursion
_:PathPath
	sh:alternativePath (
		( [ sh:zeroOrMorePath rdf:rest ] rdf:first )
		( sh:alternativePath [ sh:zeroOrMorePath rdf:rest ] rdf:first )
		sh:inversePath
		sh:zeroOrMorePath
		sh:oneOrMorePath
		sh:zeroOrOnePath 
	) .

shsh:PathShape
	a sh:NodeShape ;
	rdfs:label "Path shape"@en ;
	rdfs:comment "A shape that can be used to validate the syntax rules of well-formed SHACL paths."@en ;
	rdfs:seeAlso <https://www.w3.org/TR/shacl/#property-paths> ;
	sh:property [
		sh:path [ sh:zeroOrMorePath _:PathPath ] ;
		sh:node shsh:PathNodeShape ;
	] .

shsh:PathNodeShape
	sh:xone (                           # path-metarule
			[ sh:nodeKind sh:IRI ]          # 2.3.1.1: Predicate path
			[ sh:nodeKind sh:BlankNode ;    # 2.3.1.2: Sequence path
			  sh:node shsh:PathListWithAtLeast2Members ;
			]
			[ sh:nodeKind sh:BlankNode ;    # 2.3.1.3: Alternative path
			  sh:closed true ;
			  sh:property [
			    sh:path sh:alternativePath ;
			    sh:node shsh:PathListWithAtLeast2Members ;
			    sh:minCount 1 ;
			    sh:maxCount 1 ;
			  ]
			]
			[ sh:nodeKind sh:BlankNode ;    # 2.3.1.4: Inverse path
			  sh:closed true ;
			  sh:property [
			    sh:path sh:inversePath ;
			    sh:minCount 1 ;
			    sh:maxCount 1 ;
			  ] 
			]
			[ sh:nodeKind sh:BlankNode ;    # 2.3.1.5: Zero-or-more path
			  sh:closed true ;
			  sh:property [
			    sh:path sh:zeroOrMorePath ;
			    sh:minCount 1 ;
			    sh:maxCount 1 ;
			  ] 
			]
			[ sh:nodeKind sh:BlankNode ;    # 2.3.1.6: One-or-more path
			  sh:closed true ;
			  sh:property [
			    sh:path sh:oneOrMorePath ;
			    sh:minCount 1 ;
			    sh:maxCount 1 ;
			  ] 
			]
			[ sh:nodeKind sh:BlankNode ;    # 2.3.1.7: Zero-or-one path
			  sh:closed true ;
			  sh:property [
			    sh:path sh:zeroOrOnePath ;
			    sh:minCount 1 ;
			    sh:maxCount 1 ;
			  ] 
			]
		) .

shsh:PathListWithAtLeast2Members
	a sh:NodeShape ;
	sh:node shsh:ListShape ;
	sh:property [
		sh:path [ sh:oneOrMorePath rdf:rest ] ;
		sh:minCount 2 ;    # 1 other list node plus rdf:nil
	] .