{"id":4319,"date":"2020-10-30T22:02:17","date_gmt":"2020-10-30T21:02:17","guid":{"rendered":"https:\/\/webhosting.de\/?p=4319"},"modified":"2020-10-30T22:02:17","modified_gmt":"2020-10-30T21:02:17","slug":"xml-extensible-markup-language","status":"publish","type":"post","link":"https:\/\/webhosting.de\/da\/xml-extensible-markup-language\/","title":{"rendered":"XML (Extensible Markup Language)"},"content":{"rendered":"<p>Forkortelsen XML henviser til Extensible Markup Language, som bruges til at repr\u00e6sentere hierarkisk strukturerede data. <a href=\"https:\/\/webhosting.de\/da\/personenbezogene-daten-sozialen-netzwerken\/\">Data<\/a> i tekstfilformat. XML anvendes ogs\u00e5 til udveksling af data mellem computersystemer, som er uafh\u00e6ngig af platforme og implementeringer.<\/p>\n<h3>Funktionerne i XML<\/h3>\n<p>XML-specifikationen definerer et metasprog, p\u00e5 grundlag af hvilket de applikationsspecifikke sprog bestemmes af indholds- og strukturelle begr\u00e6nsninger. Begr\u00e6nsningerne udtrykkes ved hj\u00e6lp af XML- eller DTD-skemaer. Eksempler p\u00e5 XML-sprog er MathML, RSS, GraphML, XAML eller GPX samt selve XML-skemaet. Et XML-dokument best\u00e5r af teksttegn i UTF-8-kodningen. Det er muligt at se og redigere XML i alle editorer, der underst\u00f8tter UTF-8. Hvis et XML-dokument skal indeholde bin\u00e6re data, skal disse data kodes som tekst, hvortil der kan anvendes forskellige kodningstyper. I XML-dokumenter anses elementet for at v\u00e6re den vigtigste strukturelle enhed, og elementer indeholder b\u00e5de tekst og andre elementer som indhold. Navnet p\u00e5 et XML-element kan bestemmes frit i XML-dokumenter uden DTD. I XML-dokumenter med DTD skal elementnavnene fremg\u00e5 af DTD'en, og elementet skal v\u00e6re i en position, der er tilladt i strukturtr\u00e6et. Indholdet af hvert element er defineret i DTD'en. Elementerne betragtes som informationsb\u00e6rere i et XML-dokument,<\/p>\n<h3>Historien om XML<\/h3>\n<p>XML er opst\u00e5et af den grund, at programmeringssproget <a href=\"https:\/\/webhosting.de\/da\/html-hypertext-markup-language\/\">HTML<\/a> har n\u00e5et sine gr\u00e6nser p\u00e5 et vist tidspunkt.<br \/>\nSelv om HTML har opn\u00e5et meget, blev dets begr\u00e6nsninger tydelige meget tidligt i starten af internettet, og det blev relativt hurtigt klart, at der var behov for et sprog, som gav mulighed for at definere alle tags universelt. Med SGML fandtes der et l\u00e6ngere, universelt dokumentsprog, som HTML ogs\u00e5 blev afledt af, men det viste sig at v\u00e6re for kompliceret til internettet. Med XML blev der udviklet et meget let dokumentsprog, som kan udvides vilk\u00e5rligt. XML bruges til at definere egne tags p\u00e5 en ukompliceret m\u00e5de, hvor udseendet er fastlagt i mods\u00e6tning til betydningen, som ikke er defineret. Et tag st\u00e5r enten alene eller omslutter et omr\u00e5de. Tags har en eller flere parametre eller slet ingen. Parametre har v\u00e6rdier, som er omsluttet og tildelt specifikke kommandoer. Taggene kan v\u00e6re indlejret i hinanden, og dataene kan s\u00e5ledes struktureres hierarkisk.<\/p>\n<h3><a href=\"https:\/\/webhosting.de\/wp-content\/uploads\/2017\/03\/Fotolia_140932888_XS.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-2644 alignright\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2017\/03\/Fotolia_140932888_XS.jpg\" alt=\"xml\" width=\"424\" height=\"283\" \/><\/a>Fordelene ved XML<\/h3>\n<p>Grundl\u00e6ggende kan XML bruges til enhver form for beskrivelse, lagring eller udveksling af data. Fordelene ved XML ligger i den udbredte anvendelse og den dermed forbundne lave indl\u00e6ringsindsats, i dets popularitet og i den lethed, hvormed det kan anvendes. <a href=\"https:\/\/webhosting.de\/da\/bessere-lesbarkeit-mit-yoast-seo-erreichen-die-anleitung\/\">L\u00e6sbarhed<\/a> for maskine og menneske. Sammenlignet med sit eget bin\u00e6re format, som er kompakt, er ulemperne bl.a. det st\u00f8rre hukommelsesbehov og den til tider langsommere behandling. Begge aspekter spiller dog n\u00e6ppe nogen rolle i dag, s\u00e5 fordelene opvejer ulemperne, og XML har derfor kunnet etablere sig p\u00e5 mange omr\u00e5der.<\/p>\n<h3>Forskellige anvendelsesomr\u00e5der<\/h3>\n<p>Ud over brugen af nye tags til at skrive dokumenter omfatter de forskellige anvendelsesomr\u00e5der ogs\u00e5<br \/>\nat der kan genereres forskellige outputformater fra den samme XML-side, og at oprettelsen af websiden kan ske ved at adskille design og programmering.<\/p>","protected":false},"excerpt":{"rendered":"<p>Mit der Abk\u00fcrzung XML wird die Extensible Markup Language (englisch f\u00fcr &#8222;erweiterbare Auszeichnungssprache&#8220;) bezeichnet, die der Darstellung von hierarchisch strukturierten Daten in Textdatei-Format dient. XML wird zudem auch f\u00fcr den Austausch von Daten, die unabh\u00e4ngig von Plattformen und Implementierungen sind, zwischen Rechner-Systemen verwendet. Die Merkmale von XML Durch die XML-Spezifikation wird eine Metasprache definiert, auf 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