xml应用技术课件

《xml应用技术课件》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、IntroductiontoXML-----XMLforBeginners1.XML–theSnakeOiloftheInternetage?2.BasicXMLConcepts3.DefiningXMLDataFormats4.QueryingXMLData1SnakeOil?•SnakeOilistheall-curingdrugthesestrangeguysinwild-westmoviessell,travellingfromtowntotown,butvisitingeachtownonlyonce.

2、•Google:"snakeoil"xmlÞsome2000hits•"XMLrevolutionizessoftwaredevelopment"•"XMListheall-healing,world-peaceinducingtoolforcomputerprocessing"•"XMLenablesapplicationportability"•"ForgettheWeb,XMListhenewwaytobusiness"•"XMListhecureforyourdataexchange,informatio

3、nintegration,dataexchange,[x-2-y],[younameit]problems"•"XML,theMotherofallWebApplicationEnablers"•"XMLhasbeenthebestinventionsinceslicedbread"2XMLisnot…•AreplacementforHTML(butHTMLcanbegeneratedfromXML)•Apresentationformat(butXMLcanbeconvertedintoone)•Aprogra

4、mminglanguage(butitcanbeusedwithalmostanylanguage)•Anetworktransferprotocol(butXMLmaybetransferredoveranetwork)•Adatabase(butXMLmaybestoredintoadatabase)3Butthen–whatisit?XMLisametamarkuplanguagefortextdocuments/textualdataXMLallowstodefinelanguages("applicat

5、ions")torepresenttextdocuments/textualdata4XMLbyExample

6、ksnice,but…5XMLbyExample…thisisXML,too:GerhardWeikumTheWebin10Years•Hardtounderstandforhumanusers•Notexpressive(nosemanticsalongwiththedata)•Wellstructured,easytoreadandwritefromprograms6XMLbyExample…andwhataboutthisXMLdocum

7、ent:ch37fhgks73j5mv9d63h5mgfkds8d984lgnsmcns983•Impossibletounderstandforhumanusers•Notexpressive(nosemanticsalongwiththedata)•Unstructured,readandwriteonlywithspecialprogramsTheactualbenefitofusingXMLhighlydependsonthedesignoftheapplication.7Pos

8、sibleAdvantagesofUsingXML•TrulyPortableData•Easilyreadablebyhumanusers•Veryexpressive(semanticsneardata)•Veryflexibleandcustomizable(nofinitetagset)•Easytousefromprograms(libsavailable)•E