anchor.diff:      
         <tr>
           <td>start_date</td>
  -        <td></td>
  -        <td>
  -          <em>Optionally</em>, the employment start date of the employee. <br />
  -          If given, needs to be in <strong>YYYY/MM/DD</strong> format, where <em>YYYY</em> is the year including the century,
  +        <td>Yes</td>
  +        <td>
  +          The employment start date of the employee. <br />
  +          Must be supplied in the <strong>YYYY/MM/DD</strong> format, where <em>YYYY</em> is the year including the century,
             <em>MM</em> is the month number (1 to 12) and <em>DD</em> is the day number for the respective month.
           </td>
         </tr>
  
positive.code:     
        <tr>
          <td>email</td>
          <td>Yes</td>
          <td>
            Must be a valid email address, in the form 
          </td>
        </tr>
      
  
negative.code:     
        <tr>
          <td>take_on_balance_as_at</td>
          <td><strong>*</strong>Yes</td>
          <td>
            <strong>*Required</strong> if take on balances are given. <br />
            The effective date for the take on balances. <br />
            If given, needs to be in <strong>YYYY/MM/DD</strong> format, where <em>YYYY</em> is the year including the century,
            <em>MM</em> is the month number (1 to 12) and <em>DD</em> is the day number for the respective month. <br />
          </td>
        </tr>
      
  