ique Identifier). When you add episodes 
to your RSS podcast feed, GUIDs are compared in case-sensitive fashion 
to determine which episodes are new. If you don’t add the GUID for an 
episode, the episode URL will be used&nbsp;instead.</p>
					<p>The GUID should be assigned to an episode only once and should 
never change. Assigning new GUIDs to existing episodes may cause issues 
with your podcast’s listing and chart placement in&nbsp;the 
iTunes&nbsp;Store.</p>
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