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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

what is variations in raman spectra for nanomaterials
Jyoti Reply
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.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
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 did you get the value of 2000N.What calculations are needed to arrive at it
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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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