Razor view with weird rule

gistfile1.txt

@model InnovativeSystems.OSS.OrderClient.Modules.Order.Web.EditRatePlanModel

@{
    ViewBag.Title = "Edit";
}
<script>
  $(document).ready(function () {
    $('.rate-plan-attributes input:text').editMaskValidate();
  });
</script>
<style>
.checkbox-attribute 
{
    list-style-type:none;
}
</style>
<article id="edit_rate_plan">
  <header>
    <h1>
      @Model.PlanName
    </h1>
  </header>

  <p>
    @Model.UserInstructions
  </p>

  <p>
    @Html.ValidationSummary()
  </p>
  @using(var form = Html.BeginRouteForm("UpdateRatePlanUrl")) {
    
    @Html.HiddenFor(m => m.ServiceId)

    <ol class="rate-plan-attributes" data-attributemax="@Model.MaximumQuantity" data-attributemin="@Model.MinimumQuantity">
    @foreach(var attrValue in Model.TextValues) {
   
      <li>
       <input type="text" name="ratePlanAttributeValue" 
              value="@attrValue.Value" 
              data-editormask="@attrValue.EditMask"  
              data-validateurl="@Url.RouteUrl("ValidateRatePlanAttributeUrl")" />
      </li> 
    
    }        
    </ol>
        
    if(Model.CheckValues.Any()) {
         
       <input name="ratePlanAttributeSelection"
            type="hidden"
            value="THIS_IS_HERE_SO_THAT_THE_INCOMING_FORM_DATA_IS_NOT_NULL" />
      
      <ul>
        @foreach(var attrValue in Model.CheckValues) {
           <li class="checkbox-attribute">

        @if(attrValue.ExclusiveSelection) {
  
          <input  name="ratePlanAttributeSelection"
                    type="radio"
                    value="@attrValue.Value"
                    @Html.CheckedIf(attrValue.IsChecked) /> @attrValue.Value

          } else {
  
            <input name="ratePlanAttributeSelection"
                  type="checkbox"
                    value="@attrValue.Value"
                    @Html.CheckedIf(attrValue.IsChecked) /> @attrValue.Value

          }
        </li>

        }
      
      </ul>
    }
    <input type="submit" value="Save Changes" />
}
</article>