Module HowTo - Defining the RDN
Every LDAP DN starts with a RDN (relative DN). This is the value of a
LDAP attribute. Users usually use "uid", groups use "cn".
You can provide a list of suitable RDN attributes for your module and
give them a priority, too.
You will need to implement the function 
get_RDNAttributes() or use 
meta['RDN'].
Example:
The 
posixAccount module
offers to create accounts with DNs uid=foo,dc=.... and cn=foo,dc=...
The uid attribute has a higher priority as it is the usual attribute
for Unix accounts.
  
    
      | /** * Returns meta data that is interpreted by parent
class
 *
 * @return array array with meta data
 */
 function
get_metaData() {
 $return = array();
 // RDN attributes
 $return["RDN"] = array("uid"
=> "normal", "cn" => "low");
 [...]
 
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