SomeClass.as

/**
 *  linkage view and logic cross over each swf.
 */
package com.example.ui
{
    import flash.display.*;

    [Embed(source='path/to/assets.swf', symbol='com.example.assets.SomeClass')]
    public class SomeClass extends Sprite
    {
        public function SomeClass()
        {
            // (snip)
        }
    }
}