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According to The Adobe Flash Builder 4 and Flex 4 Bible by David Gassner,

When you compile a Flex application, your MXML code is rewritten in the background into pure ActionScript 3. MXML can be described as a "conveniencelanguage" for ActionScript 3 that makes it easier and faster to write your applications that if you had to code completely in ActionScript.

Easier and faster is debatable

In my opinion, as a person with many years of object-oriented programming experience, it is debatable whether coding ActionScript programs in Flex is easier and faster than coding them in pure ActionScript. Any program that can be coded in Flex can also be coded in pure ActionScript, but the reverse isnot true.

XML, not ActionScript

In any event, the purpose of the lessons in this series is to teach XML and not to teach ActionScript programming. (ActionScript OOP is a different course that I teach at the college.) Therefore, insofar as practical, the lessons in this series will concentrate on Flex programming and not on ActionScript programming.

However, to understand the differences between Flex 3 and Flex 4, it will sometimes be necessary to refer to ActionScript, particularly insofar as thedocumentation is concerned.

Preview

Run the Flex program named Namespace02

If you have the Flash Player plug-in (version 10 or later) installed in your browser, click here to run the program that I will explain in this lesson.

If you don't have the proper Flash Player installed, you should be notified of that fact and given an opportunity to download and install the Flash Playerplug-in program.

Namespaces is an XML concept

The concept of namespaces is an XML concept. It is not a concept that is exclusive to Flex. However, because Flex is an XML-basedprogramming language, Flex makes heavy use of namespaces.

I explained the concept of XML namespaces in the earlier lesson titled XML - Namespaces - Flex 3 . I also presented and explained a relatively simple Flex program that illustrated the use of XML namespaces to resolve nameconflicts.

Some of the differences between Flex 3 and Flex 4

In this lesson, I will present a somewhat broader view of namespaces and will also present and explain a program that illustrates some of the differencesbetween Flex 3 and Flex 4.

In explaining the differences between Flex 3 and Flex 4, I will need to dig a little more deeply into the Flex programming language than was the case in theearlier lesson.

The program that I explained in the earlier lesson was written exclusively using Flex 3. The program that I will explain in this lesson was writtenexclusively in Flex 4. The new Flex 4 program approximates the look and feel of the Flex 3 programfrom the earlier lesson.

Discussion and sample code

Two ways to create Flex projects

As I explained in the earlier lesson, Flex projects can be created using nothing more than a texteditor and a Flex software development kit (SDK) that is freely available from the Adobe website. However, to make the development of Flex projects a littleeasier, Adobe previously sold a product named Flex Builder 3 and now sells a replacement product named Flash Builder 4 , which includes the Flex 3 and Flex 4 SDKs along with avisual project editor.

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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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