drupalContentTypeInClassAttribute.php

<?php
/**
 * Add content type to the class of the row.
 */
function MODULE_preprocess_semanticviews_view_unformatted(&$vars, $hook) {
  if ($hook == 'semanticviews_view_unformatted__package__node_content_1') {

    // The index in the field array is the simple field name and is consistent
    // across joins. e.g. when the field is 'type', the field alias could be
    // 'node_node_data_field_package_content_type' if it's at the end of a
    // join.
    $alias = $vars['view']->field['type']->field_alias;

    // The 'type' field is excluded, and when Views themes style output, the
    // excluded fields are not available in $vars['rows']. Reaching into the
    // result property of the view object is necessary.
    foreach ($vars['view']->result as $id => $row) {

      // The value is the machine name of the content type.
      $type = $row->{$alias};

      // Row attributes are used by Semantic Views to add class attributes to
      // each themed row of Views output.
      if (empty($vars['row_attributes'][$id]['class'])) {
        $vars['row_attributes'][$id]['class'] = $type;
      }
      else {
        $vars['row_attributes'][$id]['class'] .= ' '. $type;
      }
    }
  }
}

example.html

<!-- This is actual output from Semantic Views. The content type is the last item on the rows' class attributes. -->
<div id="package-node_content_1" class="view view-package view-id-package view-display-id-node_content_1 view-dom-id-4">
  <ul>
    <li class="first odd blog">
      <a href="/node/16529">EI video of Olmert protest goes global</a> 
    </li>
    <li class="even video">
      <a href="/node/17637">Citizens arrest, disruption of Olmert in San Francisco</a> 
    </li>
    <li class="last odd story">
      <a href="/node/14985">The ugly reality of settlement-made beauty products</a> 
    </li>
  </ul>
</div>