[antlr-interest] what does 'UP' AND <UP> mean?

[YingAnnie]

Hello,
 
 
I am playing with Tree grammar, I got the error today:
 
F:\Treegrammar.g: node from after line 9:15 required (...)+ loop did not match anything at input 'UP'
F:\Treegrammar.g: node from after line 9:15 mismatched input 'MULTIPLICATIVE_EXPRESSION' expecting <UP>
 
what does  'UP' AND  <UP> mean?
 
 
 Thanks in advance.
 
 
 Annie

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