XML eXtensible Markup Language Erik Forsström Olle Wessel Patrik Löfgren.

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Session I - Introduction

Session I - Introduction

Presentation transcript:

XML eXtensible Markup Language Erik Forsström Olle Wessel Patrik Löfgren

XML eXtensible Markup Language

Background  XML = HTML + SGML  HTML Unstructured No custom tags Present simple information

SGML  SGML != internet Recycling of information Structure information Intelligent information Complex

XML  Structured informaton  Elements = content + tags  No layout information  DTD specifies structure  XML schemas = DTD 2.0  Attribute  Unique tags

XML on the web  XML != replacement off HTML  Seperate data from HTML  Store data inside HTML documents  Format for exhange information  Store data in files and dadabases

Conversion XML to HTML  Seding XML to PC conversion on PC User PC Converter from XML to HTML Intermediate HTML document Converter from XML to HTML CSS and/or XSL Layout information Server XML document

Conversion XML to HTML  Conversion on the server before transmission User PC Converter from XML to HTML Intermediate HTML document Converter from XML to HTML CSS and/or XSL Layout information XML document Server

Conversion XML to HTML  Conversion on the server before storage Server Intermediate HTML document Converter from XML to HTML CSS and/or XSL Layout information XML document Converter from XML to HTML Intermediate HTML document User PC Store of prepared HTML pages Ordinary HTTP sever dispatching web pages on request

XML and DTD James Bond historiegränd umeå Clark Kent fysikgränd umeå

XML on browser

XML with style sheet heroes { background-color: #ffffff; width: 100%; } NAMN { display: block; margin-bottom: 30pt; margin-left: 0; } EFTERNAMN { color: #FF0000; font-size: 20pt; } adress { color: #0000FF; font-size: 20pt; } STAD { color: #AAFF99; } James Bond historiegränd umeå Clark Kent fysikgränd umeå



XHTML  Harder and fast syntax rules  Elements properly nested  Documents must be well-formed  Tag names in lowercase  All elements must be closed

XML user interfaces  XML for define user interfaces  ZUL  Easy to uppdate interfaces

The Future of XML  Relies on the big companies Unite around a few standards Early adoption to XML has risks and oppurtunities  Business to business applications

Negative aspects  Open standards may give users a feeling of lacking security  Too many XML schemas  XML demands more initial work from the developers  Definitions and relations between tags must make sense Programmers not known for careful syntactic, grammatic and semantic correctness  Old profession data analyst would be needed again

XML on the internet  XML, HTML and other languages will interoperate, not compete  XML makes it theoretically possible to represent information differently Speech processing Braille writing

XML on the internet  Internet infrastructure will remain the same, XML is added on top  New applications RSS Metro (will compete with pdf, Microsoft standard)