io.dylemma.xml.ChainSyntax
ChainConcat implementation that handles concatenation of a two-item chain by appending the head item, then appending the tail item.
P ++ (A ~ B) = P ~ A ~ B
ChainConcat implementation that handles concatenation of a two-item chain by appending the head item, then appending the tail item.
P ++ (A ~ B) = P ~ A ~ B