强制输出wml格式

<browserCaps>
            <result type="System.Web.Mobile.MobileCapabilities, System.Web.Mobile, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
            <use var="HTTP_USER_AGENT"/>
                    preferredRenderingType = "wml11"
                    preferredRenderingMime = "text/vnd.wap.wml"
                    preferredImageMime = "image/vnd.wap.wbmp"
</browserCaps>

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