FX, MX, and s namespaces in flex 4

Flex 4 brings us a brand new namespace. Understanding these namespaces must be a good thing. Flex 4 has three important namespaces:

• Xmlns: FX = "http://ns.adobe.com/mxml/2009 ″
• Xmlns: MX = "Library: // ns.adobe.com/flex/halo"
• Xmlns: S = "Library: // ns.adobe.com/flex/spark"

 

1. xmlns: FX = "http://ns.adobe.com/mxml/2009 ″

The FX namespace containsTop-level elements of ActionScriptAndBuilt-in labels in the mxml Compiler.

The former top-level elements of ActionScript refer to objects, numbers, Boolean, and array objects. You can view the complete top-level elements in the top-level package of Adobe Flex 4 beta language reference. The labels built into the mxml compiler in the latter include <FX: SCRIPT>, <FX: declarations>, and <FX: style>, you can view the complete compiler elements in "mxml only tags" in the appendix (appendixes) of Adobe Flex 4 beta language reference.It is worth noting thatThis namespace does not contain halo and spark components (halo is the component library of previous versions, and spark is the new component library of flex 4 ). Find the "mxml-2009-manifest.xml" file under the flash builder installation directory (for example, my computer is C:/program files/Adobe/flash builder beta/sdks/4.0.0/frameworks/mxml-2009-manifest.xml ), this XML file describes the complete top-level class of ActionScript. However, you can note that it does not contain the mxml compiler labels, because these labels are built into the mxml compiler.

2. xmlns: MX = "Library: // ns.adobe.com/flex/halo"

The MX namespace contains the components in the MX. * package, flex charts, and flex data visualization components. If you are familiar with Flex 3, you are no stranger to the components in the MX package. You can find the "halo-manifest.xml" file under the flex 4 SDK installation directory (for example, my computer is C: /program files/Adobe/flash builder beta/sdks/4.0.0/frameworks/halo-manifest.xml), which lists all the components.

3. xmlns: S = "Library: // ns.adobe.com/flex/spark"

The S namespace is nothing new. All the components in the spark. * package are in this namespace. Not only the spark package, but also the text framework class of the flashx. * package is in this namespace. This namespace contains many RPC classes, such as WebService, httpservice, and remoteobject components. These components are also in the MX namespace. That is to say, when creating these components, you can not only use "s: "prefix. You can also use the" mx: "prefix. In fact, not only do these RPC components share two namespaces, such as graphics, effect, and state classes, but also share the S and MX namespaces. Open the spark-manifest.xml file in the flex 4 SDK installation directory to see the complete spark components.

The following lists the classes that share the S and MX namespaces.:

 

Category	Class
RPC classes	MX. messaging. channels. amfchannel MX. rpc. callresponder MX. messaging. channelset MX. messaging. Consumer MX. messaging. channels. httpchannel MX. rpc. http. mxml. httpservice MX. messaging. Producer MX. rpc. remoting. mxml. remoteobject MX. rpc. remoting. mxml. Operation MX. messaging. channels. rtmpchannel MX. messaging. channels. secureamfchannel MX. messaging. channels. securestreamingamfchannel MX. messaging. channels. securehttpchannel MX. messaging. channels. securestreaminghttpchannel MX. messaging. channels. securertmpchannel MX. messaging. channels. streamingamfchannel MX. messaging. channels. streaminghttpchannel MX. rpc. Soap. mxml. WebService MX. rpc. Soap. mxml. Operation MX. Data. mxml. dataservice
Graphics classes	MX. Graphics. bitmapfill MX. Geom. compoundtransform MX. Graphics. gradiententry MX. Graphics. lineargradient MX. Graphics. lineargradientstroke MX. Graphics. radialgradient MX. Graphics. radialgradientstroke MX. Graphics. solidcolor MX. Graphics. solidcolorstroke MX. Graphics. Stroke MX. Geom. Transform
Effedt classes	MX. effects. Parallel MX. effects. Sequence MX. States. Transition MX. effects. Wait
States Classes	MX. States. State MX. States. additems

To learn more about flex 4, download Adobe Flex 4 help.