Source File Overlay

<?xml version="1.0"?>
<query>
    <userid>[UserID]</userid> <!-- required -->
    <userkey>[UserKey]</userkey> <!-- required -->
    <action>AddMedia</action> <!-- required -->
    <source>[SourceFile1]</source> <!-- required -->
    <source>
        <url>[SourceFile2]</url> <!-- required -->
        <overlay>
            <!-- Video overlay params -->
        </overlay>
        <audio_overlay>
            <!-- Audio overlay params -->
        </audio_overlay>
        <text_overlay>
            <!-- Text overlay params -->
        </text_overlay>
    </source>
    <source>
        <url>[SourceFile3]</url>
        <!-- Source params -->
    </source>
    <format> <!-- required -->
        <!-- Format params --> 
    </format>
</query>

{
    "query": {
        "userid": "[UserID]", // required
        "userkey": "[UserKey]", // required
        "action": "AddMedia", // required
        "source": [ // required
            "[SourceFile1]", 
            {
                "url": "[SourceFile2]", // required
                "overlay": [
                    {
                        // Video overlay params
                    }
                ],
                "audio_overlay": [
                    {
                        // Audio overlay params
                    }
                ],
                "text_overlay": [
                    {
                        // Text overlay params
                    }
                ]
            },
            {
                "url": "[SourceFile3]"
                // Source params
            }
        ],
        "format": { // required
            // Format params
        }
    }
}