OptionalcodeNumeric code attribute, or undefined when the server sent none/garbage.
OptionaljidThe user the error belongs to; absent when it applies to the whole query.
OptionalprotocolThe protocol node the error came from (e.g. 'devices'), when nested in one.
Optionaltexttext/reason attribute, when present.
One error reported by a USync IQ.
jidis absent for query-level errors.