Figure 2

A simple Boolean network encoded in SBML qual; the three network components are Boolean, whereby C is activated by A and inhibited by B. These regulatory effects are embodied in the Transition element (tr_C), which has 2 inputs (A and B, which levels are not modified by the transition), one output (C, whose assigned level is defined in the listOfFunctionTerms of the transition). The defaultTerm is set to 0, while its sole functionTerm specifies (in the form of a MathML element) that C is 1 when A = 1 and B = 0. Note that the SBML format is intended to be readable by computers only; hence the code presented in this figure is for illustration purposes only.