title: Optional field elements in a typo3 Flexible Content Element
body: <p>Is it possible to add an optional field element in an FCE(Flexible content element)?
  if not is it possible to sustain the mapping of a FCE field element if and only if user input a value for that field in FCE?</p>
  
  <p>And also I want to know how to include a plugin or other FCE‘s inside a FCE.</p>