xml輕松學習手冊86695

xml輕松學習手冊86695

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1、XML輕松學習手冊(1)XML快速入門前言XML越來越熱,關(guān)于XML的基礎(chǔ)教程網(wǎng)絡上也隨處可見??墒且淮蠖训母拍詈托g(shù)語往往讓人望而生畏,很多朋友問我:XML到底有什么用,我們是否需要學習它?我想就我個人學習過程的心得和經(jīng)驗,寫一篇比較全面的介紹文章。首先有兩點是需要肯定的:第一:XML肯定是未來的發(fā)展趨勢,不論是網(wǎng)頁設(shè)計師還是網(wǎng)絡程序員,都應該及時學習和了解,等待只會讓你失去機會;第二:新知識肯定會有很多新概念,嘗試理解和接受,您才可能提高。不要害怕和逃避,畢竟我們還年輕。提綱本文共分五大部分。分別是XML快速入門,XML的

2、概念,XML的術(shù)語,XML的實現(xiàn),XML的實例分析。最后附錄介紹了XML的相關(guān)資源。作者站在普通網(wǎng)頁設(shè)計人員的角度,用平實生動的語言,向您講述XML的方方面面,幫助你撥開XML的神秘面紗,快速步入XML的新領(lǐng)域。第一章:XML快速入門一.什么是XML?二.XML是新概念嗎?三.使用XML有什么好處?四.XML很難學嗎?五.XML和HTML的區(qū)別六.XML的嚴格格式七.關(guān)于XML的更多一.什么是XML?這往往是第一個問題,也往往在第一個問題上你就會搞不明白,因為大多的教材上這樣回答:XML是ExtensibleMarkupLa

3、nguage的簡寫,一種擴展性標識語言。這是標準的定義。那么什么是標志語言,為什么叫擴展性?已經(jīng)讓人有些糊涂。我想我們這樣來理解會好一些:對HTML你已經(jīng)非常熟悉了吧,它就是一種標記語言,記得它的全稱嗎:"HypertextMarkupLanguage"超文本標記語言。明白了?同時,HTML里面有很多標簽,類似,等,都是在HTML4.0里規(guī)范和定義,而XML里允許你自己創(chuàng)建這樣的標簽,所以叫做可擴展性。這里有幾個容易混淆的概念要提醒大家:1.XML并不是標記語言。它只是用來創(chuàng)造標記語言(比如HTML)的元語言。天,又糊涂了!

4、不要緊,你只要知道這一點:XML和HTML是不一樣的,它的用處途比HTML廣泛得多,我們將在后面仔細介紹。2.XML并不是HTML的替代產(chǎn)品。XML不是HTML的升級,它只是HTML的補充,為HTML擴展更多功能。我們?nèi)詫⒃谳^長的一段時間里繼續(xù)使用HTML。(但值得注意的是HTML的升級版本XHTML的確正在向適應XML靠攏。)3.不能用XML來直接寫網(wǎng)頁。即便是包含了XML數(shù)據(jù),依然要轉(zhuǎn)換成HTML格式才能在瀏覽器上顯示。下面就是一段XML示例文檔(例1),用來表示本文的信息:

</p><p>5、XMLQuickStart

ajie

ajie@aolhoo.com

20010115

注意:1.這段代碼僅僅是代碼,讓你初步感性認識一下XML,并不能實現(xiàn)什么具體應用;2.其中類似,<author>的語句就是自己創(chuàng)建的標記(tags),它們和HTML標記不一樣,例如這里的<title>是文章標題的意思,HTML里的<title>是頁</p><p>6、面標題二.XML是新概念嗎?不是。XML來源于SGML,一種比HTML更早的標志語言標準。關(guān)于SGML,我們來簡單了解一下,你只需要有個大致概念就可以。SGML全稱是"StandardGeneralizedMarkupLanguage"(通用標識語言標準)??疵Q就知道:它是標志語言的標準,也就是說所有標志語言都是依照SGML制定的,當然包括HTML。SGML的覆蓋面很廣,凡是有一定格式的文件都屬于SGML,比如報告,樂譜等等,HTML是SGML在網(wǎng)絡上最常見的文件格式。因此,人們戲稱SGML是HTML的"媽媽"。而XML就</p><p>7、是SGML的簡化版,只不過省略了其中復雜和不常用的部分。(哦,明白了!是HTML第二個"mother",難怪比HTML功能強大呢。),和SGML一樣,XML也可以應用在金融,科研等各個領(lǐng)域,我們這里講的,只是XML在web方面的運用而已。到這里,你應該有點明白了:XML是用來創(chuàng)建定義類似HTML的標記語言,然后再用這個標記語言來顯示信息。三.使用XML有什么好處?有了HTML,為什么還需要用XML?因為現(xiàn)在網(wǎng)絡應用越來越廣泛,僅僅靠HTML單一文件類型來處理千變?nèi)f化的文檔和數(shù)據(jù)已經(jīng)力不叢心,而且HTML本身語法十分不嚴密,嚴</p><p>8、重影響網(wǎng)絡信息傳送和共享。(想想瀏覽器兼容的問題傷透多少設(shè)計師的腦細胞啊。)人們早已經(jīng)開始探討用什么方法來滿足網(wǎng)絡上各種應用的需要。使用SGML是可以的,但SGML太龐大,編程復雜,于是最終選擇了"減肥"的SGML---XML作為下一代web運用的數(shù)據(jù)傳輸和交互的工具。使用XML有什么好處</p> </div> <div id="d7g1tjd" class="mt-3 bg-white"> <div 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