/usr/share/doc/model-builder/examples/lotka-volterra2.ode is in model-builder 0.4.1-6.2.
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The actual contents of the file can be viewed below.
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<!--Model Builder 0.3.5 - model definition file-->
<body>
<modelname>
lotka-volterra2.ode
</modelname>
<equation number="0">
Presa=r*Presa-h*Presa*Pred
</equation>
<equation number="1">
Pred=-h*Pred+Presa*Pred
</equation>
<parameter number="0">
r=3
</parameter>
<parameter number="1">
h=2
</parameter>
<end>
10
</end>
<step>
0.1
</step>
<start>
0
</start>
<init>
1 1
</init>
</body>
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