SENG 422 Lab 5 An Introduction to XML

Time: ELW B220 from (4:00 - 6:50) every TuesdayTA: Philip Baback Alipour

Ph.D. Candidate in Electrical, Computer Engineering and Quantum Physics,Dept. of Electrical and Computer Engineering, University of Victoria, CA

Email: philipbaback_orbsix@msn.com Office: ELW Room # A358

SENG 422 Lab 5 An Introduction to XML

- XML, or Extensible Markup Language is a markup language using which you can create your own tags.

- XML was created to overcome the shortcomings of HTML

WHY XML?

-HTML was designed for humans not machines (high level representation of data).

-In HTML browser just follows the instructions and does not understand the content (information traversing across www).

WHY XML?

- XML Separates Data from HTML

- XML Simplifies Data; SharingXML Simplifies Data Sharing

- XML Simplifies Platform Changes

A Comparison

XML Separates Data from HTML

An Example

- A tag is the text between the brackets (<) and (>).

Such as <greeting> and </greeting>)

- An element is the starting tag, the ending tag,

and everything in between.

- An attribute is a name-value pair inside the starting tag

of an element. In this example, state is an attribute of

the <city> element.

Some Rules

- The root element: Everything should be inside one element

- No overlapping between elements

- End tags are required

- Elements are case sensitive

Data Definition

Two Methods:

- Document Type Definition

- XML Schema

XML Schema

- XML schemas use XML syntax

- XML schemas support data types

- XML schemas are extensible

- XML schemas have more expressive power

Schema Example

r

Schema Example

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Assignment

Create a schema for a checklist. It may contain the following:

- Surveyor ID

- Location

- Weather

- Last Modification Date