The @start@ & @end@ constructs limits the occurce content of a tag to the content between those 2 constructs

HTML RESULT 
{data 'myArray'}
  [1,2,3]
{/data}
{myArray}

  <table border="1">
    <tr> <td> Before the first occurrence </td> </tr>

    @start@
      <tr> <td> For every occurence       </td> </tr>
    @end@

    <tr> <td> After the last occurrence   </td> </tr>
  </table>

{/myArray}
Before the first occurrence
For every occurence
For every occurence
For every occurence
After the last occurrence 
{data 'myArray'}
 []
{/data}
{myArray}

  <table border="1">
    <tr> <td> Before the first occurrence </td> </tr>
    @start@
      <tr> <td> For every occurence       </td> </tr>
    @end@
    <tr> <td> After the last occurrence   </td> </tr>
  </table>

@else@

  <p> No occurences at all </p>

{/myArray}

No occurences at all