void changeVersion(
    in DOMString oldVersion,
    in DOMString newVersion,
    in SQLTransactionCallback callback,
    in SQLTransactionErrorCallback errorCallback,
    in VoidCallback successCallback); 

void readTransaction(
    in SQLTransactionCallback callback,
    in SQLTransactionErrorCallback errorCallback,
    in VoidCallback successCallback); 

void transaction(
    in SQLTransactionCallback callback,
    in SQLTransactionErrorCallback errorCallback,
    in VoidCallback successCallback); 

readonly attribute DOMString version;