Format of saving taxonomy terms with node.save via JSON

Hi,

I'm using Services 6.x-2.2.

I need to save a node with services JSON-RPC from iphone, in fact, it works with some simple fields, such as cck textfield. But i want to select taxonomy tems which is a list box, in this node, there is a vocabulary 'voc' and it has three terms, and I have tried all the various possibilities with the format according to the format of php(http://drupal.org/node/507650?destination=node%2F507650) or Flex code(http://hybridhacking.com/node/27).

For examples:
\"taxonomy\":[{\"voc\":[\"5991\":\"5992\"]}] 5991 and 5992 are tid
\"taxonomy\":[{\"59\":[\"5991\":\"5992\"]}] 59 is vid

Thanks
Léo