Some components are created inside packages or directory structures so that they can be logically grouped and separated from application code. As a result, packaged components can have a namespace declaration that includes the package name or a unique namespace identifier that references their location within a package.

You compile packaged components similarly to how you compile components that are not in packages. The only difference is that you must use the package name in the namespace declaration, regardless of how you compiled the SWC file, and that package name uses dot-notation instead of slashes. You must be sure to specify the location of the classes in the source-path.

In the following command-line example, the MyButton component is in the mypackage package:

compc -source-path . c:/flexdeploy/comps/mypackage/ 
    -output c:/jrun4/servers/flex2/flex/WEB-INF/flex/user_classes/MyButtonComp.swc 
    -include-classes mypackage.MyButton

These options appear in a configuration file, as the following example shows:

<compiler>
    <source-path>
        <path-element>.</path-element>
        <path-element>c:/flexdeploy/comps/mypackage/</path-element>
    </source-path>
    <output>
        c:/jrun4/servers/flex2/flex/WEB-INF/flex/user_classes/MyButtonComp.swc
    </output>
</compiler>
<include-classes>
    <class>mypackage.MyButton</class>
<include-classes>

To access the MyButton class in your application, you must declare a namespace that includes its package; for example:

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:mine="mypackage.*">

You can use the compc compiler to compile components from multiple packages into a single SWC file. In the following command-line example, the MyButton control is in the mypackage package, and the CustomComboBox control is in the acme package:

compc -source-path . 
    -output c:/jrun4/servers/flex2/flex/WEB-INF/flex/user_classes/CustomComps.swc 
    -include-classes mypackage.MyButton 
    acme.CustomComboBox

You then define each package as a separate namespace in your MXML application:

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:mine="mypackage.*" xmlns:acme="acme.*">
    <mine:MyButton/>
    <acme:CustomComboBox/>
</mx:Application>