SENG 422 Lab 5
An Introduction to XML
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Time: ELW B220 from (4:00 - 6:50) every Tuesday
TA: Philip Baback Alipour
Ph.D. Candidate in Electrical, Computer Engineering and Quantum Physics,
Dept. of Electrical and Computer Engineering, University of Victoria, CA
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Email: [email protected]
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
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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