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Learn enough about XML namespaces to be able to handle the namespace requirements of simple Flex projects. Also get your first taste of creating MXML files for Flex projects.
Click Namespace01 to run this Flex program. (Click the "Back" button in your browser to return to this page.)

Table of contents



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

Flex is a programming language based on XML. Therefore, in order to program with Flex, you must firstunderstand XML. The lessons in this XML series provide a brief introduction to XML.

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 figures andlistings while you are reading about them.


  • Figure 1 . The directory tree for the project named Namespace01.
  • Figure 2 . Program output at startup.
  • Figure 3 . Screen output for upgraded Flex project.


  • Listing 1 . Skeleton MXML code for a new Flex project.
  • Listing 2 . Upgraded Flex project code.
  • Listing 3 . Contents of the file named Label.mxml.
  • Listing 4 . Contents of the file named Button.mxml
  • Listing 5 . Contents of the file named NameSpace01.mxml.

Supplemental material

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

General background information

XML namespaces make it possible to combine two or more XML documents into a single XML document and todeal with problems that arise when the same name is used for an element in two or more of the XML documents.


The XML namespace topic is very broad. I won't attempt to cover the topic of namespaces in this lesson. Instead, I will illustrate and explain a somewhat restricted use of namespaces by explaining a Flex project that combinesthree XML documents with conflicting element names.

Before getting into the detailed code, I will show you a couple of images that I will be referring back to later.

The project file structure

When you create a Flex project, you create a directory tree on the disk to contain the files and folders that make up the project. The tree is rooted in afolder that has the same name as the name that you give to the project. In this lesson, I will explain a Flex project named Namespace01.

Figure 1 shows the directory tree for this project. Figure 1 is a snapshot of the Flex Builder 3 Navigator panel.

The directory tree for the project named namespace01.

Missing image.
The directory tree for the project named Namespace01.

Lots of folders and files

The directory tree contains a relatively large number of folders and files. Fortunately, most of the folders and files are generated automatically by FlexBuilder 3. As Flex programmers, we are primarily interested in the folders and files that are children of the folder named src .

Questions & Answers

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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?
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.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit 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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