grid.xml

<?xml version="1.0"?>
<SpineML xmlns="http://nineml.org/9ML/0.1">
 <LayoutClass name="grid">
  <Parameter name="numNeurons" dimension="?"/>
  <Parameter name="rowLen" dimension="?"/>
  <Spatial>
   <Regime name="">
    <Transform variable="x" order="1" dimension="??" type="translate">
     <MathInline>mod(t,rowLen)</MathInline>
    </Transform>
    <Transform variable="y" order="2" dimension="??" type="translate">
     <MathInline>floor(t/rowLen)</MathInline>
    </Transform>
    <Transform variable="t" order="3" dimension="??" type="translate">
     <MathInline>t+1</MathInline>
    </Transform>
   </Regime>
   <StateVariable name="x" dimension="?"/>
   <StateVariable name="y" dimension="?"/>
   <StateVariable name="z" dimension="?"/>
   <StateVariable name="t" dimension="?"/>
  </Spatial>
 </LayoutClass>
</SpineML>