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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



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.


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


  • 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

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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