docs: private Expression eqvOp(Data data) throws TemplateException {
  	Expression expr = xorOp(data);
  	while (data.srcCode.forwardIfCurrentAndNoWordAfter("eqv")) {
  	    comments(data);
  	    expr = data.factory.opBool(expr, xorOp(data), Factory.OP_BOOL_EQV);
  	}
  	return expr;
      }