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/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:annotation (
      [ a sx:Annotation ; sx:predicate <http://a.example/annot1> ; sx:object "1" ]
      [ a sx:Annotation ; sx:predicate <http://a.example/annot2> ; sx:object "2" ]
      [ a sx:Annotation ; sx:predicate <http://a.example/annot3> ; sx:object "3" ] )
    ] ] .