docs: def visitShapeOr(self, ctx: ShExDocParser.ShapeOrContext):
          """ shapeOr: shapeAnd (KW_OR shapeAnd)* """
          if len(ctx.shapeAnd()) > 1:
              self.expr = ShapeOr(id=self.label, shapeExprs=[])
              for sa in ctx.shapeAnd():
                  sep = ShexShapeExpressionParser(self.context)
                  sep.visit(sa)
                  self.expr.shapeExprs.append(sep.expr)
          else:
              self.visit(ctx.shapeAnd(0))