To while away the weary wintry hours, I have been writing a bit of 
entry-level tutorial documentation about some of the more recondite 
aspects of the ODD system. Three of them (they're very short!) are now 
at a point where I think they might be worth a look by someone else, so 
I hereby announce their availability and would warmly welcome any 
comment, correction, suggestion, brickbats, etc. you may have [1]. You 
can read them online[2] at the following addresses:

http://teic.github.io/TCW/howtoGenerate.html : how to generate an ODD 
automatically from a bunch of TEI XML documents

http://teic.github.io/TCW/howtoChain.html : how to derive one ODD from 
another

http://teic.github.io/TCW/purifyDoc.html : how to upgrade an existing 
ODD to use the new ("pure ODD") features introduced with release 3.0 of 
TEI P5

I chose these topics because at least one person has asked me for 
guidance on them in the last few months, but I would also welcome 
suggestions for other things that need to be better explained (or 
explained at all). I know that many members of the TEI Community are 
well clued up in how to use the ODD system, largely thanks to several 
excellent courses run by several people (you know who you are); but I 
think there's still scope for some more evangelism on the topic.

[1] Probably not necessary to send lengthy comments to the whole list;  
I assume most of its readers know where to find me.

[2] These HTML files use the super cool CETEICEAN thingy to access the 
original TEI XML sources directly from the obscure corner of the TEI 
Github repo where they are maintained.