XML (RSS/Atom) element for podcast teaser enclosure.
xmlns:tsr="https://lab.mabe.at/podcast/feed/teaser/"
<tsr:teaser>
possible in channel and/or item element.
<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:tsr="https://lab.mabe.at/podcast/feed/teaser/">
<channel>
<title>My Podcast</title>
<atom:link type="text/html" href="https://mypodcast.pod/" />
<tsr:teaser url="https://mypodcast.pod/teaser.mp3" length="1200" type="audio/mpeg" />
</channel>
<item>
<title>First Episode</title>
<link href="https://mypodcast.pod/episode001"/>
<pubDate>Sat, 08 Feb 2016 23:25:19 +0100</pubDate>
<description>First episode</description>
<enclosure url="https://mypodcast.pod/episode001/episode001.mp3" length="87062309" type="audio/mpeg"/>
<tsr:teaser url="https://mypodcast.pod/episode001/teaser.mp3" length="15919" type="audio/mpeg" />
</item>
</rss>