plist structure

Heime <[email protected]>
Newsgroups gmane.emacs.help
Message-ID <3auqG0sDkAigL-Q-065GLOFpAorln704KalUJKVyNDoVZk9xC5Os9IthPAQMyS1_RmbSC5UnMXtn6-E8RFBO2shpqHaBid70cDRq2IykRas=@protonmail.com> 
Consider this property list

'(:10pt 283.46456 :pt 28.34646 :mm 10 :in 0.3937 :ft 0.03281)

It looks like a normal list to be, with elements next to each other.

What determines whether a list is a normal list or a plist?  Is it 
just the parsing routines that read the same list differently (e.g.
with plist-get)?
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