Google Play Podcasts

Google Play uses an XML schema to define additional elements and attributes that can appear in your podcast RSS file.

The Google Play Podcast Schema:
http://www.google.com/schemas/play-podcasts/1.0/play-podcasts.xsd

For more information about creating an RSS feed and submitting it to Google Play Music:
http://support.google.com/googleplay/podcasts/answer/6260341