An XML request is primarily defined by its topmost object reference (cf. "Overview over "Object reference"). However, the XML request is further characterized by a state that is formed by a set of Boolean process attributes, namely

"copy" attribute

The copy attribute defines the XML request as an identical copy of an initial request.
The absence of the copy attribute in reverse defines the XML request as "normal" (initial) request.

It is considered an error to send a XML request with turned on copy attribute without having prior sent a "normal" request.

"storno" attribute

The storno attribute cancels the XML request defined by the topmost reference object.
The absence of the storno attribute in reverse defines the XML request as "normal" request.

It is considered an error to send a XML request with turned on storno attribute without having prior sent a "normal" request.