@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix shex: <http://www.w3.org/ns/shex#> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<http://a.example/Sext> a shex:Shape ;
    shex:expression [ a shex:TripleConstraint ;
            shex:predicate <http://a.example/p2> ] .

[] a shex:Schema ;
    shex:shapes <http://a.example/Sext> .