You may find you need to transform MixedCase or camelCasedWords into a path; for readability,
OS policies, or other reasons, you also need to lower case this, and you want to separate the words using a dash ('-').
An inflector can do this for you.
$string = 'camel Cased Words';
$filter = new Zend_Filter();
$filtered = $filter->filter($string);
$filtered = 'pages/' . $filtered . '.html';
$inflector = new Zend_Filter_Inflector('pages/:page.:suffix');
':page' => array('Word_SeparatorToDash', 'StringToLower'),
'suffix' => 'html',
$filtered = $inflector->filter(array('page' => $string));