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<!-- Reviewed: no -->
<sect1 id="zend.http.user-agent">
    <title>Zend_Http_UserAgent</title>

    <sect2 id="zend.http.user-agent.intro">
        <title>Overview</title>

        <para>
            With the plethora of mobile devices available on the market, it's increasingly important
            to be able to identify the capabilities of those devices in order to present content in
            a an appropriate way. For instance, if the device is not capable of displaying images,
            you might want to omit them from the markup; alternately, if a device is capable of
            Flash, you may want to provide a Flash-based user interface.
        </para>

        <para>
            The process of identifying a device's capabilities typically first requires knowing the
            HTTP User Agent, and then comparing that user agent against a database of user agent
            capabilities. <classname>Zend_Http_UserAgent</classname> was created to provide these
            capabilities for your applications. It consists of several major features:
        </para>

        <itemizedlist>
            <listitem>
                <para>
                    The primary <classname>Zend_Http_UserAgent</classname> class, which detects the
                    User Agent, and gives you a device object, as well as persists the device object
                    for later retrieval.
                </para>
            </listitem>

            <listitem>
                <para>
                    A <link linkend="zend.http.user-agent-device">Zend_Http_UserAgent_Device</link>
                    interface, and a number of implementations that implement it. These objects
                    utilize a features adatper to discover device capabilities, and then allow you
                    to introspect those capabilities.
                </para>
            </listitem>

            <listitem>
                <para>
                    A <link linkend="zend.http.user-agent-features">Zend_Http_UserAgent_Features_Adapter</link>
                    interface; concrete implementations provide the ability to discover device
                    capabilities, or features.
                </para>
            </listitem>

            <listitem>
                <para>
                    A <link linkend="zend.http.user-agent-storage">Zend_Http_UserAgent_Storage</link>
                    interface, which is used to persist discovered devices for given users, allowing
                    for faster device capability discovery on subsequent page visits.
                </para>
            </listitem>

            <listitem>
                <para>
                    A <link linkend="zend.view.helpers.initial.user-agent">view helper</link> that
                    can be used within your view scripts and layouts to branch display logic based
                    on device capabilities.
                </para>
            </listitem>

            <listitem>
                <para>
                    A <classname>Zend_Application</classname> <link
                        linkend="zend.application.available-resources.useragent">resource</link> for
                    configuring and instantiating the user agent object, as well as seeding the view
                    helper with the user agent object instance.
                </para>
            </listitem>
        </itemizedlist>

        <para>
            At the time of this writing, The <classname>UserAgent</classname> component provides
            three adapters:
        </para>

        <itemizedlist>
            <listitem>
                <para>
                    <link
                        linkend="zend.http.user-agent-features-browscap">Zend_Http_UserAgent_Features_Adapter_Browscap</link>
                    utilizes PHP's native <ulink url="http://php.net/get_browser"><function>get_browser()</function></ulink>
                    in conjunction with <ulink url="http://browsers.garykeith.com/">browscap</ulink>.
                    While the database featureset is not as fine-grained as other projects, for the
                    majority of purposes, it provides reliable, fast results.
                </para>
            </listitem>

            <listitem>
                <para>
                    <link
                        linkend="zend.http.user-agent-features-tera-wurfl">Zend_Http_UserAgent_Features_Adapter_TeraWurfl</link>
                    consumes the TeraWurfl API, which is built on top of <ulink
                        url="http://wurfl.sourceforge.net/"><acronym>WURFL</acronym></ulink>,
                    and aimed at providing a highly available, highly performant lookup mechanism.
                </para>
            </listitem>

            <listitem>
                <para>
                    <link
                        linkend="zend.http.user-agent-features-device-atlas">Zend_Http_UserAgent_Features_Adapter_DeviceAtlas</link>
                    consumes the DeviceAtlas API, which is a paid, Enterprise-grade mobile device
                    capabilities database.
                </para>
            </listitem>
        </itemizedlist>
    </sect2>

    <sect2 id="zend.http.user-agent.quick-start">
        <title>Quick Start</title>

        <para>
            First, you will need to download the <filename>php_browscap.ini</filename> if you do not
            already have it installed on your system:
        </para>

        <itemizedlist>
            <listitem>
                <para>
                    <ulink url="http://browsers.garykeith.com/stream.asp?PHP_BrowsCapINI">php_browscap.ini</ulink>
                </para>
            </listitem>
        </itemizedlist>

        <para>
            We suggest that you put the file in the same directory as your
            <filename>php.ini</filename>.
        </para>

        <para>
            Next, notify PHP of the browscap file via the <varname>browscap</varname> setting.
            Because this setting is of type <constant>PHP_INI_SYSTEM</constant>, this must be done
            either in your <filename>php.ini</filename> or web server configuration; it cannot be
            done in <filename>htaccess</filename> or via <function>ini_set()</function>. We
            recommend adding it to your <filename>php.ini</filename>.
        </para>

        <programlisting language="ini"><![CDATA[
browscap = /path/to/php_browscap.ini
]]></programlisting>

        <para>
            If you put <varname>php_browscap.ini</varname> in the same directory as your
            <filename>php.ini</filename>, this can be reduced to simply:
        </para>

        <programlisting language="ini"><![CDATA[
browscap = php_browscap.ini
]]></programlisting>

        <para>
            Now, edit your <filename>application.ini</filename> to add the following lines to your
            <varname>[production]</varname> section:
        </para>

        <programlisting language="ini"><![CDATA[
resources.useragent.mobile.features.classname = "Zend_Http_UserAgent_Device_Features_Browscap"
]]></programlisting>

        <para>
            At this point, everything is setup. Each request will contain detailed information on
            the user agent.
        </para>

        <para>
            You can access this information in a variety of ways. From within the MVC portion of
            your application, you can access it via the bootstrap. Within plugins, this is done by
            grabbing the bootstrap from the front controller.
        </para>

        <programlisting language="php"><![CDATA[
$bootstrap = Zend_Controller_Front::getInstance()->getParam('bootstrap');
$userAgent = $bootstrap->getResource('useragent');
]]></programlisting>

        <para>
            From your action controller, use <methodname>getInvokeArg()</methodname> to grab the
            bootstrap, and from there, the user agent object.
        </para>

        <programlisting language="php"><![CDATA[
$bootstrap = $this->getInvokeArg('bootstrap');
$userAgent = $bootstrap->getResource('useragent');
]]></programlisting>

        <para>
            Within your view, you can grab it using the <classname>UserAgent</classname> view
            helper.
        </para>

        <programlisting language="php"><![CDATA[
$userAgent = $this->userAgent();
]]></programlisting>

        <para>
            Once you have the user agent object, you can query it for different capabilities. As one
            example, you may want to use an alternate layout script based on the user agent
            capabilities.
        </para>

        
        <programlisting language="php"><![CDATA[
$device = $userAgent->getDevice();

$cssSupport    = $device->getFeature('cssversion');
$jsSupport     = $device->getFeature('javascript');

switch (true) {
    case ($jsSupport && $cssSupport >= 3):
        $layout->setLayout('layout-html5');
        break;
    case ($jsSupport && $cssSupport < 3):
        $layout->setLayout('layout-xhtml');
        break;
    case (!$jsSupport && $cssSupport < 3):
        $layout->setLayout('layout-html-transitional');
        break;
    default:
        $layout->setLayout('layout-web-1');
        break;
}
]]></programlisting>

        <para>
            Finally, each device will often have a large number of capabilities not immediately
            represented in the device interface. You can query these using the
            <methodname>hasFeature()</methodname> and <methodname>getFeature()</methodname> methods,
            or simply grab all of them with <methodname>getAllFeatures()</methodname>.
        </para>

        <programlisting language="php"><![CDATA[
if ($userAgent->hasFeature('mp3') && $userAgent->getFeature('mp3')) {
    // embed HTML5 audio tag...
}
]]></programlisting>
    </sect2>

    <sect2 id="zend.http.user-agent.options">
        <title>Configuration Options</title>

        <variablelist>
            <title>UserAgent Options</title>

            <para>
                The following options may be passed to the constructor or within your application
                configuration. A "." indicates another layer of depth in the configuration array.
            </para>

            <para>
                Each features adapter has its own options available as well, which may be mixed in
                with the general UserAgent options.
            </para>

            <varlistentry>
                <term>browser_type</term>

                <listitem>
                    <para>
                        Used to seed the list of devices the component will search. See also
                        <varname>identification_sequence</varname>; this value will be prepended to
                        that list during user agent device discovery.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>http_accept</term>

                <listitem>
                    <para>
                        The value of the <varname>Accept</varname> <acronym>HTTP</acronym> header;
                        used by some user agents to determine capabilities. Set this to seed the
                        value explicitly.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>identification_sequence</term>

                <listitem>
                    <para>
                        A comma-separated list of device types to scan for matches; defaults to
                        "mobile,desktop".
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>storage.adapter</term>

                <listitem>
                    <para>
                        The name of a storage adapter used to persist the device capabilities,
                        typically within a given user session. The value may either be a fully
                        qualified class name, or a short name to resolve by the plugin loader for
                        storage classes. By default, uses "Session" as the value, resolving to
                        <classname>Zend_Http_UserAgent_Storage_Session</classname>.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>storage.options[]</term>

                <listitem>
                    <para>
                        An array of options to pass to the constructor of a storage adapter. By
                        default, the option <varname>browser_type</varname> will be present.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>plugin_loader.[type] = [class]</term>

                <listitem>
                    <para>
                        Plugin loader configuration; allows you to specify a pre-configured
                        <classname>Zend_Loader_PluginLoader</classname> extension class to use for
                        one of the plugin loader types managed by <classname>UserAgent</classname>
                        (currently "storage" and "device".
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>server[]</term>

                <listitem>
                    <para>
                        Typically, you will not set this; this simply allows injection of the
                        <varname>$_SERVER</varname> superglobal (or a filtered version of it). The
                        value should be an associative array.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>user_agent</term>

                <listitem>
                    <para>
                        The actual <acronym>HTTP</acronym> User-Agent string you wish to try and
                        match. Typically, this will be auto-discovered from the
                        <varname>server</varname> array.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>[browser_type].device.classname</term>

                <listitem>
                    <para>
                        The device class to use for a given browser type; typically,
                        <varname>browser_type</varname> will be one of the supported browser
                        devices, including:
                    </para>

                    <itemizedlist>
                        <listitem><para>Bot</para></listitem>
                        <listitem><para>Checker</para></listitem>
                        <listitem><para>Console</para></listitem>
                        <listitem><para>Desktop</para></listitem>
                        <listitem><para>Email</para></listitem>
                        <listitem><para>Feed</para></listitem>
                        <listitem><para>Mobile</para></listitem>
                        <listitem><para>Offline</para></listitem>
                        <listitem><para>Probe</para></listitem>
                        <listitem><para>Spam</para></listitem>
                        <listitem><para>Text</para></listitem>
                        <listitem><para>Validator</para></listitem>
                    </itemizedlist>

                    <para>
                        The <varname>browser_type</varname> should be normalized to lowercase for
                        configuration purposes.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>[browser_type].device.path and [browser_type].device.prefix</term>

                <listitem>
                    <para>
                        An alternate way to specify the device class for a given browser type is to
                        assume it is named after the device, and that all device classes are in the
                        same path sharing the same prefix. Configure the prefix and path using these
                        keys.
                    </para>

                    <para>
                        As an example, the following would look for a class named
                        "Mobile_Device_Bot" on the path "Mobile/Device/" under the application
                        library.
                    </para>

                    <programlisting language="ini"><![CDATA[
resources.useragent.bot.device.path = APPLICATION_PATH '/../library/Mobile/Device"
resources.useragent.bot.device.prefix = "Mobile_Device"
]]></programlisting>
                </listitem>
            </varlistentry>

            <varlistentry>
                <term>[browser_type].features.path and [browser_type].features.classname</term>

                <listitem>
                    <para>
                        These settings are used to load the features capabilities detection class
                        for a given browser type. The class will be named using the
                        <varname>classname</varname> key, and is expected to exist in the file
                        denoted by the <varname>path</varname> key. The class should implement
                        <classname>Zend_Http_UserAgent_Features_Adapter</classname>.
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </sect2>

    <sect2 id="zend.http.user-agent.methods">
        <title>Available Methods</title>

        <variablelist>
            <varlistentry id="zend.http.user-agent.methods.constructor">
                <term>
                    <methodsynopsis>
                        <methodname>__construct</methodname>
                        <methodparam>
                            <funcparams>$options = null</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        The constructor attempts to determine the current User-Agent based on the
                        options provided, the current request information, and/or previously discovered
                        information persisted in storage. Once instantiated, the detected device is
                        immediately available.
                    </para>

                    <para>
                        Please see <link linkend="zend.http.user-agent.options">configuration
                            options</link> section for details on the <varname>$options</varname> array.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.serialize">
                <term>
                    <methodsynopsis>
                        <methodname>serialize</methodname>
                        <methodparam>
                            <funcparams></funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Defined by the <interfacename>Serializable</interfacename> interface, this
                        method performs logic necessary to determine what within the object should be
                        serialized when the object is serialized by a storage adapter.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.unserialize">
                <term>
                    <methodsynopsis>
                        <methodname>unserialize</methodname>
                        <methodparam>
                            <funcparams>$serialized</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Defined by the <interfacename>Serializable</interfacename> interface, this
                        method performs logic necessary to determine how to unserialize a previously
                        serialized instance.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-options">
                <term>
                    <methodsynopsis>
                        <methodname>setOptions</methodname>
                        <methodparam>
                            <funcparams>$options</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Initializes object state. Please see the <link
                            linkend="zend.http.user-agent.options">configuration options</link> section
                        for information on the <varname>$options</varname> array.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-user-agent">
                <term>
                    <methodsynopsis>
                        <methodname>getUserAgent</methodname>
                        <methodparam>
                            <funcparams></funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieve the discovered User-Agent string. Unless set explicitly, this will be
                        autodiscovered from the server array.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-user-agent">
                <term>
                    <methodsynopsis>
                        <methodname>setUserAgent</methodname>
                        <methodparam>
                            <funcparams>$userAgent</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Set the User-Agent string explicitly. Once <methodname>getDevice()</methodname>
                        has been called, this property is marked immutable, and calling this method will
                        raise an exception.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-http-accept">
                <term>
                    <methodsynopsis>
                        <methodname>getHttpAccept</methodname>
                        <methodparam>
                            <funcparams>$httpAccept = null</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieve the HTTP Accept header value.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-http-accept">
                <term>
                    <methodsynopsis>
                        <methodname>setHttpAccept</methodname>
                        <methodparam>
                            <funcparams>$httpAccept</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Explicitly set the HTTP Accept header value. Once
                        <methodname>getDevice()</methodname> has been called, this property is marked
                        immutable, and calling this method will raise an exception.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-storage">
                <term>
                    <methodsynopsis>
                        <methodname>getStorage</methodname>
                        <methodparam>
                            <funcparams>$browser = null</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieves a persistent storage object for a given browser type.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-storage">
                <term>
                    <methodsynopsis>
                        <methodname>setStorage</methodname>
                        <methodparam>
                            <funcparams>Zend_Http_UserAgent_Storage $storage</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Use this to explicitly set the peristent storage object. Once
                        <methodname>getDevice()</methodname> has been called, the storage is marked
                        immutable (as in: you may not inject a new storage object), and calling this
                        method will raise an exception.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.clear-storage">
                <term>
                    <methodsynopsis>
                        <methodname>clearStorage</methodname>
                        <methodparam>
                            <funcparams>$browser = null</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Clears any information in the persistent storage object.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-config">
                <term>
                    <methodsynopsis>
                        <methodname>getConfig</methodname>
                        <methodparam>
                            <funcparams></funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieve configuration parameters.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-device">
                <term>
                    <methodsynopsis>
                        <methodname>getDevice</methodname>
                        <methodparam>
                            <funcparams></funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Use this method to get the User-Agent Device object; this is the object that
                        will contain the various discovered device capabilities.
                    </para>

                    <para>
                        Discovery of the User-Agent device occurs in this method. Once the device has
                        been retrieved, the server array, browser type, user agent, http accept, and
                        storage properties are marked as immutable.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-browser-type">
                <term>
                    <methodsynopsis>
                        <methodname>getBrowserType</methodname>
                        <methodparam>
                            <funcparams></funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieve the discovered browser type; usually one of:
                    </para>

                    <itemizedlist>
                        <listitem><para>Bot</para></listitem>
                        <listitem><para>Checker</para></listitem>
                        <listitem><para>Console</para></listitem>
                        <listitem><para>Desktop</para></listitem>
                        <listitem><para>Email</para></listitem>
                        <listitem><para>Feed</para></listitem>
                        <listitem><para>Mobile</para></listitem>
                        <listitem><para>Offline</para></listitem>
                        <listitem><para>Probe</para></listitem>
                        <listitem><para>Spam</para></listitem>
                        <listitem><para>Text</para></listitem>
                        <listitem><para>Validator</para></listitem>
                    </itemizedlist>

                    <para>
                        Unless explicitly set, the browser type is unknown until
                        <methodname>getDevice()</methodname> has been called.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-browser-type">
                <term>
                    <methodsynopsis>
                        <methodname>setBrowserType</methodname>
                        <methodparam>
                            <funcparams>$browserType</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Explicitly set the browser type to prepend to the identification sequence. Once
                        <methodname>getDevice()</methodname> has been called, the browser type is marked
                        immutable, and calling this method will raise an exception.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-server">
                <term>
                    <methodsynopsis>
                        <methodname>getServer</methodname>
                        <methodparam>
                            <funcparams></funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieve the array of HTTP headers and environment variables used to perform
                        device discovery. If the array has not yet been set, it is seeded with the
                        <varname>$_SERVER</varname> superglobal.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-server">
                <term>
                    <methodsynopsis>
                        <methodname>setServer</methodname>
                        <methodparam>
                            <funcparams>$server</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Explicitly set the "server" array of HTTP headers and environment variables to
                        use during device discovery. Once <methodname>getDevice()</methodname> has been
                        called, the server array is marked immutable, and calling this method will raise
                        an exception.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-server-value">
                <term>
                    <methodsynopsis>
                        <methodname>getServerValue</methodname>
                        <methodparam>
                            <funcparams>$key</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieve a single value from the server array by key.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-server-value">
                <term>
                    <methodsynopsis>
                        <methodname>setServerValue</methodname>
                        <methodparam>
                            <funcparams>$key, $value</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Overwrite or define a value in the internal server array. Once
                        <methodname>getDevice()</methodname> has been called, the server array is marked
                        immutable, and calling this method will raise an exception.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.set-plugin-loader">
                <term>
                    <methodsynopsis>
                        <methodname>setPluginLoader</methodname>
                        <methodparam>
                            <funcparams>$type, $loader</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        <varname>$type</varname> may be one of "device" or "storage; the former is used
                        when attempting to find device classes, the latter for finding storage classes.
                        <varname>$loader</varname> may be a
                        <classname>Zend_Loader_PluginLoader</classname> instance, or a string name
                        containing the classname of a <classname>Zend_Loader_PluginLoader</classname>
                        extension class.
                    </para>
                </listitem>
            </varlistentry>

            <varlistentry id="zend.http.user-agent.methods.get-plugin-loader">
                <term>
                    <methodsynopsis>
                        <methodname>getPluginLoader</methodname>
                        <methodparam>
                            <funcparams>$type</funcparams>
                        </methodparam>
                    </methodsynopsis>
                </term>

                <listitem>
                    <para>
                        Retrieves either the "device" or "storage" plugin loader instance.
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </sect2>

    <sect2 id="zend.http.user-agent.examples">
        <title>Examples</title>

        <para>
            Please see the <link linkend="zend.http.user-agent.quick-start">quick start</link> for
            examples at this time.
        </para>
    </sect2>
</sect1>