[MlMt] How do I generate a new uuid for a signature entry in the Signatures.plist file?

[leo]

Hello fellow MailMaters

I would like to add signatures with a text editor or with a script to 
MailMate’s signature config file `MailMate/Signatures.plist`.

I can base new signatures on old ones. For example, I have already in 
`Signatures.plist` the XML snippet:

```
		<dict>
			<key>addressGlob</key>
			<string>teaching at mydomain.net</string>
			<key>html</key>
			<string></string>
			<key>htmlEnabled</key>
			<false/>
			<key>name</key>
			<string>medical</string>
			<key>string</key>
			<string>--
My Name
Social Scientist/Software Developer/Data Scientist
e: teaching at mydomain.net
</string>
			<key>uuid</key>
			<string>095B77F2-CE90-4F9D-A2CF-8E286A539A7A</string>
		</dict>
```

Creating a new snippet, say, for the email `writing at mydomain.net` is 
straight forward, except the `uuid` key which — as I suppose — 
should be unique.

How do I generate a new uuid for the new signature?


Many thanks and happy emailing,
Leo
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