Explicit
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Namespace:
Name: iTunes® (itunes)  
Declaration: xmlns:tunes="http://www.itunes.com/dtds/podcast-1.0.dtd"  

Field Description:
This tag should be used to indicate whether or not your podcast contains explicit material.  

If you populate this tag with "Yes", a parental advisory tag will appear next to your Podcast cover artwork on the iTunes® Music Store, and in the Name column in iTunes. If the value is "Clean", the parental advisory type is considered clean, meaning that no explicit language or adult content is included anywhere in the episodes. "Clean" is usually used when there both an "Explicit" and "Clean" versions of the same song or podcast.  

Field Usage:
This is a required field.  

Reference:
http://www.apple.com/itunes/podcasts/techspecs.html