Vertical list

I am interested in representing vertical lists is MathML.
For example in the case of a equation system, for example {x+y=1,x-y=0},  
it is sometimes interesting to represent in a vertical way

 /         \ 
 | x+y=1|
<          > 
 | x-y=0 |
 \         /

which way should I represent it with MathML.

Thanks in advance

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Received on Tuesday, 2 December 2003 13:30:28 UTC