protected override object DoEvaluate(ScriptThread thread)
{
BasicParameter result = null;
thread.CurrentNode = this; //standard prolog
var parametersCollection = thread.GetParametersCollection();
result = parametersCollection.Find(parameterNode.AsString);
if (result == null)
return ExpressionHelper.ComposeAstNodeError("Parameters",parameterNode);
return result.ParameterValue;
}