Creates a new instance of MessageIterator
Determines whether the given structure matches the given name, or contains a
child that does.
Returns the index of the given structure as a child of the given parent. Returns
null if the child i
Sets next to the first child of the given group (iteration always proceeds from
group to first child
Returns true if another object exists in the iteration sequence.
Tests whether the name of the given Index matches the name of the last child of
the given group.
A match exists for the given name somewhere after the given position (in the
normal serialization or
Sets the next position to a new segment of the given name, within the given
Navigates from end of group
Sets this.next to the next position in the message (from the given position),
which could be the nex
Sets next to the next repetition of the current structure.