Hi liorlankri,
Check out this link's,
http://msdn2.microsoft.com/en-us/library/ms155109.aspx
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ipsdk/html/xsfatrfield_HV01021547.asp
I hope this will help You.
Thanks.
suresh
Infopath Dev
India