<?xml version="1.0" encoding="UTF-8"?>
<sbml xmlns="http://www.sbml.org/sbml/level1" level="1" version="1">
    <model>
        <listOfUnitDefinitions>
            <unitDefinition name="substance">
                <listOfUnits>
                    <unit kind="mole" scale="-3"/>
                </listOfUnits>
            </unitDefinition>
            <unitDefinition name="mls">
                <listOfUnits>
                    <unit kind="mole"   scale="-3"/>
                    <unit kind="liter"  exponent="-1"/>
                    <unit kind="second" exponent="-1"/>
                </listOfUnits>
            </unitDefinition>
        </listOfUnitDefinitions>
        <listOfCompartments>
            <compartment name="cell"/>
        </listOfCompartments>
        <listOfSpecies>
            <specie name="x0" compartment="cell" initialAmount="1"/>
            <specie name="x1" compartment="cell" initialAmount="1"/>
            <specie name="s1" compartment="cell" initialAmount="1"/>
            <specie name="s2" compartment="cell" initialAmount="1"/>
        </listOfSpecies>
        <listOfParameters>
            <parameter name="vm" value="2" units="mls"/>
            <parameter name="km" value="2"/>
        </listOfParameters>
        <listOfReactions>
            <reaction name="v1">
                <listOfReactants>
                    <specieReference specie="x0"/>
                </listOfReactants>
                <listOfProducts>
                    <specieReference specie="s1"/>
                </listOfProducts>
                <kineticLaw formula="(vm * s1)/(km + s1)"/>
            </reaction>
            <reaction name="v2">
                <listOfReactants>
                    <specieReference specie="s1"/>
                </listOfReactants>
                <listOfProducts>
                    <specieReference specie="s2"/>
                </listOfProducts>
                <kineticLaw formula="(vm * s2)/(km + s2)"/>
            </reaction>
            <reaction name="v3">
                <listOfReactants>
                    <specieReference specie="s2"/>
                </listOfReactants>
                <listOfProducts>
                    <specieReference specie="x1"/>
                </listOfProducts>
                <kineticLaw formula="(vm * s1)/(km + s1)"/>
            </reaction>
        </listOfReactions>
    </model>
</sbml>
