08_XML_ASP_VRML

Transcript 08_XML_ASP_VRML

Advanced Web Technologies
MSc. Publishing on WWW
Why are they Important ?




Originally web pages were static: text
and images.
Information and data were stable.
Changes in data were slow.
The advanced technologies allow web
pages to be dynamic.
XML: What is it?



Extensible Markup Language.
Language for creating other languages.
Uses user defined tags and attributes to
format data.
XML : An Example
<?xml version = "1.0"?>
<student>
<picture filename="Smith_S.gif" x="100" y="100"/>
<LastName>Duck</LastName>
<FirstName>Donald</FirstName>
<year level="one">
<module> Internet Technologies </module>
<progress> Good </progress>
</year>
</student>
XML: Why use it?

Many uses:



Transfer data from server to server,
application to application.
Allows use of vocabulary relevant to the
users.
Allows experts to have a standard to
transmit their info e.g. doctor/pharmacy –
prescriptions.
XML: Why not to use it?



Very few browsers can directly view
XML pages.
No browser currently supports Xlink and
Xpointer.
Temporary fix: convert XML to HTML or
XHTML.
XML: How does it work?
XML
Doc
+
XML
Parser
XML
Application
XML
DTD
e.g MSXML, W3 parser
in Amaya, diy
e.g. MathML,
TimeMaps
XML: Examples

MathML
Mathematical Markup Language

SMIL
Synchronised Multimedia Integration
Language

SpeechML
Speech Markup Language
ASP: What is it?




Active Server Pages.
A program that runs within IIS.
Microsoft specific technology.
Example of server side scripting.
ASP: Platforms and Compatibility



ASP is a Microsoft based technology.
Typically WinNT, WIn95/98 etc.
New software allows ASP to run on
other platforms:


ChilliASP for Unix
InstantASP for Unix/Linux, Mac and others
ASP: Example
<% @LANGUAGE=VBScript %>
<% Option Explicit %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<% ' Fig. 26.1 : clock.asp %>
<HTML>
<HEAD>
<TITLE>A Simple ASP Example</TITLE>
<META HTTP-EQUIV="REFRESH" CONTENT="60; URL=CLOCK.ASP">
</HEAD>
<BODY>
Simple ASP Example

<TABLE BORDER="6">
<TR>
<TD BGCOLOR="#000000">

<% =Time( ) %>

</TD>
etc…
ASP: How does it work?
4
Server
Browser
(e.g. with IIS)
1
2
3
ASP software
(e.g. ASP.dll)
ASP: Applications




Dynamically change, add, edit web
page content.
Process data and queries from HTML
from HTML forms.
Access databases via web pages
Security: ASP scripts are not visible in
browsers.
VRML




Virtual Reality Modelling Language.
Means of creating 3D environments for
the WWW.
Used for visualisation e.g.
artefacts/buildings.
3D interactive environments; simulated
environments.

08_XML_ASP_VRML

Transcript 08_XML_ASP_VRML

Directory