'Schema with multiple root elements #1':
{|xml||
123
|}.
'Schema with multiple root elements #2':
{|xml||
|}.
'No such root element'(fail):
{|xml||
|}.
'Support xmlns:xsi':
{|xml||
123
|}.
'Support xmlns':
{|xml||
|}.
'Support xmlns:some':
{|xml||
|}.