RSS 聯(lián)合供稿使用 <feed> 元素。以下是 CNN 新聞聯(lián)合供稿的示例：
<feed refresh-interval="1800">http://rss.cnn.com/rss/cnn_topstories.rss</feed>
獲取這些更新聯(lián)合供稿的協(xié)議為 Atom 1.0、Atom 0.3、RSS 2.0 或 RSS 1.0。標(biāo)準(zhǔn)聯(lián)合供稿通常都會(huì)正常運(yùn)行。
要通過(guò)聯(lián)合供稿更新工具欄上的圖標(biāo)或工具提示說(shuō)明，您需要將特定工具欄擴(kuò)展件添加到使用名稱空間的 RSS 或 ATOM。下面是從聯(lián)合供稿中提取的心情圈圈按鈕的示例：
<?xml version="1.0" encoding="utf-8"?><custombuttons xmlns="http://toolbar.google.com/custombuttons/"><button><title>Mood ring</title><description>Your virtual mood ring</description><site>http://www.google.com/search?q=mood+ring</site><feed menu="false" refresh-interval="900">http://www.example.com/custombuttons/samples/feeds/mood</feed></button></custombuttons>注意，它指定 menu="false" 表示此聯(lián)合供稿僅用于更新圖標(biāo)和工具提示，而不能填充子項(xiàng)目的下拉菜單。
如果在實(shí)際的服務(wù)器上安裝了它，聯(lián)合供稿輸出則如下所示：
<?xml version=‘1.0‘?><feed xmlns=‘http://www.w3.org/2005/Atom‘xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘><id>http://www.example.com/custombuttons/samples/feeds/mood</id><title>Mood</title><link href=‘http://www.google.com/search?q=+ring‘ /><link rel=‘self‘href=‘http://www.example.com/custombuttons/samples/feeds/mood‘ /><gtb:description>Bluegreen:Inner emotions charged, somewhat relaxed</gtb:description><gtb:icon mode="base64" type="image/x-icon">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</gtb:icon></feed>
以上示例是 Atom 1.0 聯(lián)合供稿，包含的 Google 自定義按鈕名稱空間指定為：
xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘
要覆蓋隨按鈕出現(xiàn)的工具提示，請(qǐng)指定：
<gtb:description> new-description </gtb:description>
要覆蓋隨按鈕出現(xiàn)的圖標(biāo)，請(qǐng)指定：
<gtb:icon> icon-base64-code </gtb:icon>
控制這種復(fù)雜的“心情”分析系統(tǒng)的 PHP 腳本如下所示：
<?phpheader(‘Content-type: text/xml‘);switch(rand(1, 7)) {case 1:$icon = "amber.ico";$desc = "Amber:\nNervous, on edge, uncertain";break;case 2:$icon = "black.ico";$desc = "Black:\nTense, stressed, working too hard";break;case 3:$icon = "blue.ico";$desc = "Blue:\nComfortable, breeze, at rest, loveable";break;case 4:$icon = "bluegreen.ico";$desc = "Bluegreen:\nHeightened inner emotional state, moderately relaxed";break;case 5:$icon = "gray.ico";$desc = "Gray:\nAnxious, ill at ease, strained";break;case 6:$icon = "green.ico";$desc = "Green:\nSteady, stable, no emotional turmoil";brea;case 7:$icon = "purple.ico";$desc = "Dark Blue:\nImpassioned, delighted, whiff of romance";break;}$icon = base64_encode(file_get_contents($icon));echo "<?xml version=‘1.0‘?>";echo "\n<feed xmlns=‘http://www.w3.org/2005/Atom‘ xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘>";echo "\n<id>http://www.example.com/custombuttons/samples/feeds/mood</id>";echo "\n<title>Mood</title>";echo "\n<link href=‘http://www.google.com/search?q=$mood+ring‘ />";echo "\n<link rel=‘self‘ href=‘http://www.example.com/custombuttons/samples/feeds/mood‘ />";echo "\n<gtb:description>$desc</gtb:description>";echo "\n<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>$icon</gtb:icon>";echo "\n</feed>";?>圖標(biāo)應(yīng)該和腳本位于同一文件夾中。
您還可以將自定義服務(wù)器圖標(biāo)添加到聯(lián)合供稿下拉菜單上的單個(gè)項(xiàng)目上。下面是天氣按鈕示例，它具有包含下拉菜單（默認(rèn)值）的聯(lián)合供稿，但是還可以指定 refresh-menuitem="false" 隱藏隨時(shí)連接到服務(wù)器的刷新菜單項(xiàng)目。這樣可以提供更加簡(jiǎn)潔的外觀。
<?xml version="1.0" encoding="utf-8"?><custombuttons xmlns="http://toolbar.google.com/custombuttons/"><button><title>Weather 94043</title><description>Weather updates for Mountain View, CA</description><site>http://www.google.com/search?q=weather+94043&num=1</site><feed refresh-interval="3600" refresh-menuitem="false">http://www.example.com/custombuttons/samples/feeds/weather?zip=94043</feed></button></custombuttons>
下面是天氣聯(lián)合供稿外觀的示例，在下拉菜單中各個(gè)菜單項(xiàng)目旁邊都有自定義圖標(biāo)（為簡(jiǎn)潔起見，大多數(shù)圖標(biāo)已經(jīng)刪除 base64 編碼的資料）?；谝陨鲜纠梢娪冢?code>http://www.example.com/custombuttons/samples/feeds/weather/?zip=94043
<?xml version=‘1.0‘?><feed xmlns=‘http://www.w3.org/2005/Atom‘xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘><id>http://www.example.com/custombuttons/samples/feeds/weather</id><title>Weather Mountain View, CA</title><link href=‘http://www.google.com/search?q=weather+94043/‘ /><link rel=‘self‘href=‘http://www.example.com/custombuttons/samples/feeds/weather‘ /><gtb:description>Mountain View, CA63F Mostly CloudyHumidity: 48%Wind: NW at 8 mph</gtb:description><gtb:icon mode=‘base64‘ type=‘image/x-icon‘>R0lGODlhKAAoANUAAEuc/Pz8/Fik/Ii00k9daZGPivLy8tbW1k2R0uvr6wZj3HSq0f/QMMfHx7a2tj2F0fu0EePj4yx81neUp4J/eKanphJq3IJtOGB3iI3C5BFt5B5XnWis7H2346jO5/6+IWKo8923... and so on...</gtb:icon><entry><title>Today: Mostly Cloudy 65 | 50</title><link href=‘http://www.google.com/search?q=weather+94043/‘ /><id>http://www.example.com/custombuttons/samples/feeds/weather/0</id><gtb:icon mode=‘base64‘ type=‘image/x-icon‘>R0lGODlhKAAoANUAAEuc/Pz8/Fik/Ii00k9daZGPivLy8tbW1k2R0uvr6wZj3HSq0f/QMMfHx7a2tj2F0fu0EePj4yx81neUp4J/eKanphJq3IJtOGB3iI3C5BFt5B5XnWis7H2346jO5/6+IWKo8923... and so on...</entry><entry><title>Thu: 66 | 51</title><link href=‘http://www.google.com/search?q=weather+94043/‘ /><id>http://www.example.com/custombuttons/samples/feeds/weather/1</id><gtb:icon mode=‘base64‘ type=‘image/x-icon‘>R0lGODlhKAAoAPcAAAAAAP///4WOwPT1+tDT3unr8sHG1ff5/6Wy0mZ8rGqAr3mJrJakxa+zvHSKtcDBw1R2slBql110njBXjztmqS9OfjtekTZWhGeJuoqctklLTgJYyQJQtQ9hzhRr3BZlzBVRoS1S... and so on...</gtb:icon></entry><entry><title>Fri: 67 | 51</title><link href=‘http://www.google.com/search?q=weather+94043/‘ /><id>http://www.example.com/custombuttons/samples/feeds/weather/2</id><gtb:icon mode=‘base64‘ type=‘image/x-icon‘>R0lGODlhKAAoANUAAObm52ms7k2Q0Uuc/Fmk+v2zDoS01HOp0avP5tvb26CPXQZj3DqG14yLh05YYf/IKv/VN3mCiMPDw6SkpCt82GhxePz8/JG+2pd5NRZu3hBq3fb29rCAFrm5uSN549OWE4WltqHI... and so on...</gtb:icon></entry><entry><title>Sat: 67 | 50</title><link href=‘http://www.google.com/search?q=weather+94043/‘ /><id>http://www.example.com/custombuttons/samples/feeds/weather/3</id><gtb:icon mode=‘base64‘ type=‘image/x-icon‘>R0lGODlhKAAoANUAAObm52ms7k2Q0Uuc/Fmk+v2zDoS01HOp0avP5tvb26CPXQZj3DqG14yLh05YYf/IKv/VN3mCiMPDw6SkpCt82GhxePz8/JG+2pd5NRZu3hBq3fb29rCAFrm5uSN549OWE4WltqHI... and so on...</gtb:icon></entry></feed>
為此，PHP 代碼使用天氣預(yù)報(bào)回復(fù)格式。
<?php// Script to convert Google xml weather interface to custom buttons AtomFeed 1.0// Sample input at http://www.google.com/ig/api?weather=94043// To see sample output, run this script with ?zip=94043$zip = $_GET[‘zip‘];header(‘Content-type: text/xml‘);// http://www.google.com/ig/api?weather=94043$dom= domxml_open_file("http://www.google.com/ig/api?weather=$zip");$xpath = xpath_new_context($dom);// $params = $dom->documentElement->firstChild->getElementsByTagName(‘param‘);$temp = $xpath->xpath_eval(‘//city/@data‘);$city = $temp->nodeset[0]->value;$icons = $xpath->xpath_eval(‘//current_conditions/icon/@data‘);$icon_url = $icons->nodeset[0]->value;$icon = base64_encode(file_get_contents("http://www.google.com$icon_url"));$conditions = $xpath->xpath_eval(‘//current_conditions/condition/@data‘);$condition = $conditions->nodeset[0]->value;$temp = $xpath->xpath_eval(‘//current_conditions/temp_f/@data‘);$tempf = $temp->nodeset[0]->value;$temp = $xpath->xpath_eval(‘//current_conditions/humidity/@data‘);$humidity = $temp->nodeset[0]->value;$temp = $xpath->xpath_eval(‘//current_conditions/wind_condition/@data‘);$wind = $temp->nodeset[0]->value;echo "<?xml version=‘1.0‘?>";echo "\n<feed xmlns=‘http://www.w3.org/2005/Atom‘ ";echo "xmlns:gtb=‘http://toolbar.google.com/custombuttons/‘>";echo "\n<id>http://www.example.com/custombuttons/samples/feeds/weather</id>";echo "\n<title>Weather $city</title>";echo "\n<link href=‘http://www.google.com/search?q=weather+$zip/‘ />";echo "\n<link rel=‘self‘ href=‘http://www.example.com/custombuttons/";echo "samples/feeds/weather‘ />";echo "\n<gtb:description>$city\n$tempfF $condition\n$humidity\n$wind";echo "</gtb:description>";echo "\n<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>$icon</gtb:icon>";$days = $xpath->xpath_eval(‘//forecast_conditions/day_of_week/@data‘);$conditions = $xpath->xpath_eval(‘//forecast_conditions/condition/@data‘);$icons = $xpath->xpath_eval(‘//forecast_conditions/icon/@data‘);$highs = $xpath->xpath_eval(‘//forecast_conditions/high/@data‘);$lows = $xpath->xpath_eval(‘//forecast_conditions/low/@data‘);for ($i = 0; $i < count($conditions->nodeset); $i++) {$day_of_week = $days->nodeset[$i]->value;$condition = $conditions->nodeset[$i]->value;$high = $highs->nodeset[$i]->value;$low = $lows->nodeset[$i]->value;echo "\n<entry>";echo "\n<title>$day_of_week: $condition $high | $low</title>";echo "\n<link href=‘http://www.google.com/search?q=weather+$zip/‘ />";echo "\n<id>http://www.example.com/custombuttons/samples/feeds/weather/$i</id>";$icon_url = $icons->nodeset[$i]->value;$icon = base64_encode(file_get_contents("http://www.google.com$icon_url"));echo "\n<gtb:icon mode=‘base64‘ type=‘image/x-icon‘>$icon</gtb:icon>";echo "\n</entry>";}echo "\n</feed>";?>您還可以使用相同的 http://toolbar.google.com/custombuttons/ 名稱空間和說(shuō)明或者 RSS 1.0、RSS 2.0、Atom 1.0 及 Atom 0.3 聯(lián)合供稿中的圖標(biāo)標(biāo)記用于工具欄聯(lián)合供稿。
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