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Learn about namespace differences and some of the other differences between Flex 3 and Flex 4.
Click Namespace02 to run the Flex program from this lesson. (Click the "Back" button in your browser to return to this page.)

Table of contents

Preface

General

This tutorial lesson is part of a series of lessons dedicated to programming using Adobe Flex.

The material in these lessons is based on Flex version 3 and Flex version 4. A distinction between the two will usually be made in those situations wherethat distinction is important.

A previous lesson in this series titled XML - Namespaces - Flex 3 concentrated on teaching the XML concept of namespaces and illustrated the concept using a program written in Flex version 3.

Differences in namespaces between Flex 3 and Flex 4

Some of the first things that one is likely to notice when comparing Flex version 3 to Flex version 4 are some obvious differences in the use of namespaces. Therefore, this is an opportune place in the series tointroduce Flex version 4 and to explain some of the differences between the two versions.

Viewing tip

I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the figuresand listings while you are reading about them.

Figures

  • Figure 1 . Output from Namespace01.
  • Figure 2 . Output from Namespace02.
  • Figure 3 . Project treefor the project named Namespace02.

Listings

  • Lasting 1 . Skeleton mxml code for a new Flex 3 project.
  • Listing 2 . Skeleton mxml code for a new Flex 4 project.
  • Listing 3 . The main mxml file forNamespace01.
  • Listing 4 . The main mxml file for Namespace02.
  • Listing 5 . Contents of the file named Label.mxml.
  • Listing 6 . Contents of the file named Button.mxml.

Supplemental material

I recommend that you also study the other lessons in my extensive collection of online programming tutorials. You will find a consolidated index at www.DickBaldwin.com .

General background information

Historical perspective

Adobe's Flex is an XML-based programming language that is used to create programs that execute in the Adobe Flash Player .

Teaching XML using Flex

In the Spring semester of 2010, I introduced Adobe's Flex version 3 and the Flex Builder 3 IDE into a course named Introduction to XML that I had been teaching for several years at Austin Community College in Austin, TX. The concept of usingFlex as the programming vehicle to teach XML was well received by the students.

During that same semester, Adobe released Flex version 4 and replaced Flex Builder 3 with a new IDE named Flash Builder 4 . The new IDE supports both Flex 3 and Flex 4.

A fortunate circumstance

This is a fortunate circumstance insofar as the concept of using Flex to teach XML is concerned. Flex 4 is similar to, but very different from, andsomewhat more complicated than Flex 3. The availability of the two versions of Flex makes it possible for the students to gain experience with two similar butdifferent flavors of XML, both supported by the same IDE and both supported by similarly formatted documentation.

Questions & Answers

are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
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