let $s := <a><b>1</b><b>2</b><b>3</b></a>
let $t := <a><b>2</b><b>3</b></a>

I want <b>1</b> node returned...???
I want to know that $t is missing <b>1</b>. $s is always larger set. $s should 
always include all of $t. 

for and let with where is only thing I could see. 



      
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