code: def comparison(self, t):
          
          assert(len(t) == 3)
  
          d = {"PropertyIsEqualTo": [
                  t[0], t[1], t[2]
              ]}
  
          #parts = [str(p.value) for p in t]
          #v = " ".join(parts)
  
          #v = "( {} )".format(v)
          #t[0].value = v
          #return t[0]
          return d
docs: <PropertyIsEqualTo>
      <PropertyName>NAME</PropertyName>
      <Literal>Sydney</Literal>
    </PropertyIsEqualTo>