being expressed with parameters
        <code>a</code> and
        <code>b</code> named after their positions
        in the formal argument list:</p>
    <div class="exampleOuter">
      <div class="exampleHeader">
            Procedure Call With Named and Positional Parameters</div>
      <div class="exampleInner">
        <pre>{
    "version" : "1.1",
    "method"  : "sum",
    "params"  : { "1" : 34, "c" : 56, "0" : 12 }
}</pre>
      </div>
    </div>
    <p>
        If a client chooses to send paramet