extensible markup language by: muhammad haris

8/12/2019 Extensible Markup Language By: Muhammad Haris

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XML

(Extensible Markup Language)


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Introduction: What is XML

What is XML?

XML stands for E Xtensible Markup LanguageXML is a markup language much like HTMLXML was designed to carry data , not to display dataXML tags are not predefined. You must define your own tags XML is a W3C Recommendation


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Introduction: What is XML

What is XML?

XML stands for E Xtensible Markup LanguageXML is a markup language much like HTMLXML was designed to carry data , not to display dataXML tags are not predefined. You must define your own tags XML is a W3C Recommendation

StudentsHarisReminderDon't forget to check the notice-boards!


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Introduction: XML and HTML Relationship

HTML was designed to display data. XML was designed to transport and store data.

The Difference Between XML and HTML XML is not a replacement for HTML. XML was designed to transport and store data, with focus on what

data is. HTML was designed to display data, with focus on how data looks.

HTML is about displaying information,

while XML is about carrying information.


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Example

XML Does not DO Anything XML is Just Plain Text With XML You Invent Your Own Tags XML is Not a Replacement for HTML

StudentsHarisReminderDon't forget to check the notice-boards!


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Direct Benefits of XML

XML Separates Data from HTML XML Simplifies Data Sharing XML is Platform Independent


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Structure of and XML Document


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Another Example


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Elements and Attributes

An XML element is everything from (including) the element's start tag to(including) the element's end tag. An element can contain other elements,simple text or a mixture of both. Elements can also have attributes.

XML Attributes provide additional information about elements.


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DTD (Document Type Definition)

The oldest schema format for XML is theDocument Type Definition (DTD) It uses a custom non-XML syntax to describe

the schema. It has no support for newer features of XML,

most importantly namespaces .
http://en.wikipedia.org/wiki/Document_Type_Definitionhttp://en.wikipedia.org/wiki/Featurehttp://en.wikipedia.org/wiki/XML_Namespacehttp://en.wikipedia.org/wiki/XML_Namespacehttp://en.wikipedia.org/wiki/Featurehttp://en.wikipedia.org/wiki/Document_Type_Definition


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Linking a DTD with an XML file

Inside an XML document Wrap it inside:

In an External file Add its reference in XML:


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XML Syntax Rules All XML Elements Must Have a Closing Tag

XML Tags are Case Sensitive: Opening and closing tags must bewritten with the same case:

XML Elements Must be Properly Nested

XML Documents Must Have a Root Element

XML Attribute values must be Quoted


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Well Formed and Valid

Well Formed XML with correct syntax

Valid Is already Well-Formed XML document that confirms to the rules of a

Document Type Definition or XML Schema


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XML NameSpace


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Why We are Studying

XML


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Client

WebMappingServer

DB

WMS Image (GIF,JPEG)


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XML Real Life Examples


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