What is the purpose of flash-integration.swc?

With开发者_如何学Python Flex 4 a new library called flash-integration.swc was introduced to the SDK. Does anybody know what the purpose of this library is?

It contains mx.flash.UIMovieClip, mx.flash.ContainerMovieClip and mx.flash.FlexContentHolder which are the part of Adobe Flash Component Kit for Flex and produces integration of Flash content within Flex applications. You can read more here.

It was made into it's own standalone SWC, branched off from utilities.swc.

http://forums.adobe.com/thread/534762?tstart=-1

The SWC appears to simply contain a few libraries and one component. You can find this nfo in a truncated version of the SWC's catalog below:

 <?xml version="1.0" encoding ="utf-8"?>
<swc xmlns="http://www.adobe.com/flash/swccatalog/9">
  <versions>
    <swc version="1.2" />
    <flex version="4.5.0" build="19786" minimumSupportedVersion="3.0.0" />
  </versions>
  <features>
    <feature-script-deps />
    <feature-components />
    <feature-files />
  </features>
  <components>
    <component className="mx.flash:FlexContentHolder" name="FlexComponentBase" uri="http://www.adobe.com/someNonSensicalURI"  />
  </components>
  <libraries>
    <library path="library.swf">
      <script name="mx/flash/UIMovieClip" mod="1294360346590" signatureChecksum="2489211033" >
      </script>
      <script name="mx/flash/ContainerMovieClip" mod="1288903295049" signatureChecksum="747581936" >
      </script>
      <script name="mx/flash/FlexContentHolder" mod="1275497612711" signatureChecksum="3383159784" >
      </script>
      <script name="_5388b587d6475d1d70347b16048793ca2fd9ec82f1792157b30dade9a418de69_flash_display_Sprite" mod="1295301928226" signatureChecksum="2221373773" >
      </script>
    </library>
  </libraries>
  <files>
  </files>
</swc>