TikZ user group, or alternatively specific TikZ advice.

[Taylor, P]

Could anyone inform me whether there is a dedicated TikZ mailing list / 
user group ?  If not, could any experienced TikZ user please advise me 
how (apart from \expandafter hacks or a wrapper macro) I may achieve the 
effect of  the last part of :

> \begin {tikzpicture} [decoration={text={\input very-long-text-file}, ...]

Used as-is, the \input is not expanded and the file not inserted.

Philip Taylor