The <Successes> element is a child element of the <TransmissionRs> element. The <Successes> element is the first element under the <TransmissionRs> element and is an optional element.
The <Successes> element contains 1 child element and has a sequence content model. The sequence content model means that there is a particular order to the children elements of the parent element - in this case, the <Successes> element has a particular order of elements that must be followed.