Presentation on theme: "XML stands for Extensible Markup Language."— Presentation transcript:
1 XML stands for Extensible Markup Language. Week-8 (Lecture-1)XML:XML stands for Extensible Markup Language.XML was designed to store and transport data.XML was designed to be both human- and machine-readable.Ex.XML Code Example:<note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>HTML CODE Example:<html><head> <title> test page </title></head><body><h1> hello </h1><b> how are you </b><p> new paragraph </p></body></html>
2 The Difference between XML and HTML Week-8 (Lecture-1)The Difference between XML and HTMLXML was designed to carry data - with focus on what data isHTML was designed to display data - with focus on how data looksXML tags are not predefined like HTML tags areXML Does Not Use Predefined Tags:The XML language has no predefined tags.The tags <to> and <from> are not defined in any XML standard.These tags are "invented" by the author of the XML document.HTML works with predefined tags like <p>, <h1>, <table>, etc.With XML, the author must define both the tags and the document structure.
4 XML documents are formed as element trees. Week-8 (Lecture-1)XML Tree StructureXML documents are formed as element trees.An XML tree starts at a root element and branches from the root to child elements.All elements can have sub elements (child elements)Ex.<root> <child> <subchild>.....</subchild> </child> </root>
5 The syntax for writing comments in XML is similar to that of HTML. Week-8 (Lecture-1)Comments in XMLThe syntax for writing comments in XML is similar to that of HTML.<!-- This is a comment -->Two dashes in the middle of a comment are not allowed.Ex.<!-- This is a -- comment -->
6 Week-8 (Lecture-2)XML Elements vs. Attributes: Take a look at these examples: Ex-1 Ex-2
7 XPath is a syntax for defining parts of an XML document Week-8 (Lecture-2)XML and XPath:(XPath (the XML Path language) is a language for finding information in an XML document.)XPath is a syntax for defining parts of an XML documentXPath uses path expressions to navigate in XML documentsXPath contains a library of standard functionsXPath is a major element in XSLTXPath is also used in XQuery, XPointer and XLink
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