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 (
        _:vc1) .

_:vc1 a sx:ShapeDecl ; sx:shapeExpr [ a sx:NodeConstraint ;
    sx:minlength 5 ;
    sx:nodeKind sx:literal ] .