title: PL/SQL Associative array validate if index exist
body: <p>I have this Associative array 3-d</p>
  
  <pre><code>type v_arr_class is table of varchar2(255) index by varchar2(255);
  type v_arr_component is table of v_arr_class index by varchar2(255);
  type v_arr_property is table of v_arr_component index by varchar2(255);
  
  v_arr_local_rec v_arr_property;
  </code></pre>
  
  <p>I need to validate if an index exist</p>
  
  <pre><code>if(v_arr_local_rec('class')('component')('property') exist) then
  
  do this... 
  
  end if
  </code></pre>
  
  <p>not much info about associative arrays found.</p>
  
  <p>thanks in advance.</p>