A common scenario is to let swagger-php generate a definition based on your model class.
These definitions can then be referenced with `ref="#/components/schemas/$classname"
<br />
<b>Fatal error</b>:  Uncaught Error: Class &quot;UsingRefs\Model&quot; not found in C:\www\api\vendor\zircote\swagger-php\Examples\using-refs\Product.php:14
Stack trace:
#0 {main}
  thrown in <b>C:\www\api\vendor\zircote\swagger-php\Examples\using-refs\Product.php</b> on line <b>14</b><br />