The result of the parsing phase is an object tree where each node represent an ‘atomic’ evaluation step, as in Figure 1. […]
Figure 1. Example of translation from a string cut to an object tree model. The “leaves” of the tree that refer to an object method are mapped to Reflex method calls.
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LISTA, Luca, JONES, Christopher D. and PETRUCCIANI, Giovanni, 2010. Expression and cut parser for CMS event data. Journal of Physics: Conference Series. April 2010. Vol. 219, no. 3. doi 
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