Rendering of the source text

<?xml version='1.0'?>
<model name="first_order_model" xmlns="http://www.cellml.org/cellml/1.1#" xmlns:cellml="http://www.cellml.org/cellml/1.1#">
    <component name="main">
        <variable initial_value="0" name="t" units="dimensionless"/>
        <variable initial_value="5" name="y" units="dimensionless"/>
        <variable initial_value="1" name="a" units="dimensionless"/>
        <variable initial_value="2" name="b" units="dimensionless"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>y</ci>
                </apply>
                <apply>
                    <plus/>
                    <apply>
                        <times/>
                        <apply>
                            <minus/>
                            <ci>a</ci>
                        </apply>
                        <ci>y</ci>
                    </apply>
                    <ci>b</ci>
                </apply>
            </apply>
        </math>
    </component>
</model>