* - name: string, eg "sql:civicrm_email:contact_id"
* - type: string, eg "sql"
* - count: int, eg "5" if there are 5 email addresses that refer to $dao
* - name: string, eg "sql:civicrm_email:contact_id"
* - type: string, eg "sql"
* - count: int, eg "5" if there are 5 email addresses that refer to $dao