PREFIX ex: <http://a.example>
PREFIX sx: <http://www.w3.org/ns/shex#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

[] a sx:Schema ;
    sx:shapes (
        <http://a.example/vc1>
        <http://a.example/vc2>
        <http://a.example/vc3>
        <http://a.example/S1>) .

<http://a.example/S1> a sx:ShapeDecl ; sx:shapeExpr [ a sx:Shape ;
    sx:expression [ a sx:TripleConstraint ;
            sx:predicate <http://a.example/p1> ;
            sx:valueExpr [ a sx:ShapeOr ;
                    sx:shapeExprs (
                      [ a sx:ShapeAnd ;
                        sx:shapeExprs ( <http://a.example/vc1> <http://a.example/vc2> ) ]
                      <http://a.example/vc3> ) ] ] ] .

<http://a.example/vc1> a sx:ShapeDecl ; sx:shapeExpr [ a sx:NodeConstraint ;
    sx:minlength 4 ;
    sx:nodeKind sx:literal ] .

<http://a.example/vc2> a sx:ShapeDecl ; sx:shapeExpr [ a sx:NodeConstraint ;
    sx:maxlength 5 ;
    sx:nodeKind sx:literal ] .

<http://a.example/vc3> a sx:ShapeDecl ; sx:shapeExpr [ a sx:NodeConstraint ;
    sx:nodeKind sx:literal ;
    sx:pattern "^(ab)*$" ] .