Rendering of the source text

<?xml version="1.0"?>
<model xmlns="http://www.cellml.org/cellml/1.1#" xmlns:cmeta="http://www.cellml.org/metadata/1.0#" cmeta:id="TempRC" name="TempRC">

<import xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="Units.cellml">
<units name="UnitP" units_ref="UnitP"/>
<units name="UnitQ" units_ref="UnitQ"/>
<units name="UnitR" units_ref="UnitR"/>
<units name="UnitC" units_ref="UnitC"/>
</import>

<component name="TempRC">
<variable name="Pi" initial_value="P0" public_interface="out" units="UnitP"/>
<variable name="Po" public_interface="in" units="UnitP"/>
<variable name="Qi" public_interface="in" units="UnitQ"/>
<variable name="Qo" public_interface="out" units="UnitQ"/>
<variable name="R" public_interface="in" units="UnitR"/>
<variable name="C" public_interface="in" units="UnitC"/>
<variable name="t" public_interface="in" units="second"/>
<variable name="P0" public_interface="in" units="UnitP"/>

<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply><eq/><apply><diff/><bvar><ci>t</ci></bvar><ci>Pi</ci></apply><apply><divide/><apply><minus/><ci>Qi</ci><ci>Qo</ci></apply><ci>C</ci></apply></apply><apply><eq/><ci>Qo</ci><apply><divide/><apply><minus/><ci>Pi</ci><ci>Po</ci></apply><ci>R</ci></apply></apply></math>

</component>

</model>