Is there a way to map a tag in flex to components in multiple directories?

Question

Given a flex application or module, you can specify a custom xml namespace as follows:

<mx:Module xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:custom="custom.namespace.*">

We can then refer to mxml components in the directory custom/namespace/ using the custom tag. For example, if I have the components Custom1 and Custom2 in the custom/namespace directory, I can refer to them like so:

<custom:Custom1/>
<custom:Custom2/>

Is there a way to map multiple directories onto the same tag? That is, if I have components in a subdirectory of custom/namespace, like custom/namespace/sub with component SubCustom1, is there a way to modify the flex document so the custom tag can refer to SubCustom1?

Note that one workaround I found was to add a new tag for each directory (e.g. xmlns:custom.sub="custom.namespace.sub.*", and then:

<custom.sub:SubCustom1>

This solution seems like a kludge, though.

Answer 1

The naming follows directly from the XML specification for namespaces. If you want to change custom to refer to the subdirectory change the namespace declaration:

xmlns:custom="custom.namespace.*"

to

xmlns:custom="custom.namespace.sub.*"

Answer 2

To create a custom namespace in flex you need to

1) Create a custom manifest file: e.g.

<?xml version="1.0" encoding="utf-8" ?>
<componentPackage>

    <component id="Accordion" class="mx.containers.Accordion"/>
    ....

2) Add something similar to the following to your flex-compiler.xml file:

<compiler>
    ...
      <namespaces>
         <!-- Specify a URI to associate with a manifest of components for use as MXML -->
         <!-- elements.                                                                -->
         <namespace>
            <uri>http://mycustomnamespace.com&lt;/uri&gt;
            <manifest>custom-manifest.xml</manifest>
         </namespace>
      </namespaces>
</compiler>

You can read a more detailed explanation here.

This question was also answered here.