supfile tag to use? port/src

[Drew]

Greetings,

I am a little confused by what the website says and
what the example supfiles have.  

I have two questions. 

1. When do I use "tag=."?  T he website says only use
this for ports, but in my
/usr/share/examples/cvsup/standard-supfile the tag is
set to "tag=.".   I thought "tag=." was saying 'gimme
the lastest thing available', but I could be mistaken.

2.  I am running 5.2-CURRENT and I want to upgrade to
5.2.1, must I change my tag to RELENG_5_2_1? or can I
use "tag=.", which as I understand it is suspossed to
be equal to CURRENT.  Isn't 5.2.1 now CURRENT? 

Thank you for your time in advance,

-D

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