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The project that I explained in the earlier lesson was created using Flex Builder 3. The project that I willexplain in this lesson was created using Flash Builder 4.

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Skeleton mxml code and namespaces

Skeleton mxml code for a new Flex 3 project

When you create a new Flex 3 project in Flex Builder 3 or Flash Builder 4, a skeleton of the required mxml file is created for you. Listing 1 shows thecontents of such a skeleton mxml file for a Flex 3 project.

Skeleton mxml code for a new flex 3 project.

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"layout="absolute"></mx:Application>

Created using Flex Builder 3

The skeleton code shown in Listing 1 was created using Flex Builder 3, but the skeleton code for a Flex 3 project is essentially the same regardless ofwhether it is created using Flex Builder 3 or Flash Builder 4. (Flash Builder 4 inserts a couple of relatively insignificant size attributes that are not inserted by FlexBuilder 3.)

The namespace (xmlns) attribute

In the earlier lesson, I explained the concept of the root element , and I explained that the term xmlns is the required name for a namespace attribute. (This is true for XML in general and not just for Flex mxml.) While it isn't necessary in general to include a namespace attribute in the root element, when a namespace attribute is included in the root element, it becomes the default namespace for the entire document.

Namespace is always required for a Flex project

Even though it isn't necessary to include a namespace attribute in the root element of a general XML document, it is always necessary to include the namespace attribute shown in Listing 1in the root element of the main mxml document for a Flex 3 project. That is why Flex Builder 3 includes it in the skeleton code for the project.

What does this mean?

The inclusion of the default namespace attribute shown in Listing 1 means that all elements with names that refer to componentsfrom the standard Flex 3 library of components must be prefixed with "mx:" .

Skeleton mxml code for a new Flex 4 project

As with a Flex 3 project, when you create a new Flex 4 project in Flash Builder 4, a skeleton of the mxml file is created for you. Listing 2 shows thecontents of such a skeleton mxml file for a Flex 4 project.

Skeleton mxml code for a new flex 4 project.

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955"minHeight="600"><fx:Declarations><!-- Place non-visual elements (e.g., services, value objects) here --></fx:Declarations></s:Application>

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket 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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