+ /**
+ * Determine how many other records refer to a given record
+ *
+ * @param CRM_Core_DAO $dao the item for which we want a reference count
+ * @return array each item in the array is an array with keys:
+ * - 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 $dao
+ */
+ public function getReferenceCounts($dao) {
+ return array();
+ }
+