The MAWC Tags

The opening bracket { is represented by < ts >
The closing bracket } is represented by < /ts >

<  ts>
      < ts1>
        < ts11>  < /ts11>
        < ts12>  
            < ts121>  < /ts121>
        < /ts12>
     < /ts1>
     < ts2>
       < ts21>
       < /ts21>
     < /ts2>
< /ts>