Islandora Groups DS Modify

gistfile1.php

<?php
/**
 * Implements hook_islandora_datastream_ingested().
 **/
function foo_islandora_datastream_ingested(AbstractObject $object, AbstractDatastream $datastream) {
  if ($datastream->id == 'TECHMD') {
    // Do things like changing the content of the DC datastream to blah.
    if (isset($object['DC'])) {
      $object['DC']->content = 'blah';
      $object['DC']->label = 'My awesomely edited Dublin Core';
    }
  }
}