Intro to XML课件.pptVIP

精品文档 Intro to XML Originally Presented by Clifford Lemoine Modified by Box 精品文档 Introduction to XML Review of XML What is different XML parsing? Simple Example program Wrap-up References 精品文档 Quick XML Review XML – Wave of the future Method of representing data Differs from HTML by storing and representing data instead of displaying or formatting data Tags similar to HTML tags, only they are user-defined Follows a small set of basic rules Stored as a simple ASCII text file, so portability is insanely easy 精品文档 Quick XML Review Syntax Every XML document has a preamble ?xml version=“1.0” ? An XML document may or may not have a DTD (Document Type Definition) or Schema !DOCTYPE catalog 精品文档 Quick XML Review Syntax cont. Every element has a start and end tag, with optional attributes catalog version=“1.0” … /catalog If an element does not contain any data (or elements) nested within, the closing tag can be merged with the start tag like so: catalog version=“1.0”/ 精品文档 Quick XML Review Syntax cont. Elements must be properly nested The outermost element is called the root element An XML document that follows the basic syntax rules is called well-formed An XML document that is well-formed and conforms to a DTD or Schema is called valid Once again, XML documents do not always require a DTD or Schema, but they must be well-formed 精品文档 Quick XML Review Sample XML files Catalog.xml 精品文档 ?xml version=1.0? catalog library=somewhere book authorJohn Doe/author titleTitle 1/title /book book authorPhill Smith/author titleHis One Book/title /book magazine namePC Mag/name article page=17 headlineSecond Headline/headline /article /magazine /catalog 精品文档 Let’s work in our project input Back to our original class diagram (network configuration) Define your input xml\net.xml 精品文档 What is XML Parser? A program or module that checks a well-formed syntax and provides a capability to manipulate XML data elements. Navigate thru the XML document (