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Update 1.0.md 

Added "how to programmatically spot a GUID" as well as a note about Amazon Music's use of UUIDv5 IDs.
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@ -531,16 +531,16 @@ This element defines a method of verifying integrity of the media given either a
<br><br><br><br><!-- Tag block -->
## Guid
`<podcast:guid>`<br><br>
This element is used to declare a unique, global identifier for a podcast. The value is a UUIDv5, and is easily generated from the RSS feed url, with the **protocol scheme and trailing slashes stripped off**, combined with a unique "podcast" namespace
which has a UUID of `ead4c236-bf58-58c6-a2c6-a6b28d128cb6`. Tools like [this one](https://www.uuidtools.com/v5) can help generate these values by hand. Or, language libraries like [this one](https://github.com/sporkmonger/uuidtools) in Ruby are widely
available.
This element is used to declare a unique, global identifier for a podcast. The value is a UUIDv5, and is easily generated from the RSS feed url, with the **protocol scheme and trailing slashes stripped off**, combined with a unique "podcast" namespace which has a UUID of `ead4c236-bf58-58c6-a2c6-a6b28d128cb6`. Tools like [this one](https://www.uuidtools.com/v5) can help generate these values by hand. Or, language libraries like [this one](https://github.com/sporkmonger/uuidtools) in Ruby are widely available.
A podcast gets assigned a podcast:guid once in its lifetime using its current feed url (at the time of assignment) as the seed value. That GUID is then meant to follow the podcast from then on, for the duration of its life, even if the feed url
changes. This means that when a podcast moves from one hosting platform to another, its podcast:guid should be discovered by the new host and imported into the new platform for inclusion into the feed.
A podcast gets assigned a podcast:guid once in its lifetime using its current feed url (at the time of assignment) as the seed value. That GUID is then meant to follow the podcast from then on, for the duration of its life, even if the feed url changes. This means that when a podcast moves from one hosting platform to another, its podcast:guid should be discovered by the new host and imported into the new platform for inclusion into the feed.
Using this pattern, podcasts can maintain a consistent identity across the open RSS ecosystem without a central authority.
**Tips:** A GUID is 36 characters long. All podcasts in the Podcast Index have already been assigned a GUID; but if one exists in the RSS feed, that value is canonical.
**Tips:**
* All podcasts in the Podcast Index have already been assigned a GUID; but if one exists in the RSS feed, that value is canonical.
* You can programmatically spot a GUID: it is 36 characters long, and contains four hyphen characters.
* Be aware that Amazon Music also uses UUIDv5 identifiers, which are calculated differently.
### Parent
&nbsp; `<channel>`
@ -675,4 +675,4 @@ this tag works and what it is capable of.
fee="true"
/>
</podcast:value>
```
```