[stringtemplate-interest] null vs missing vs empty vs nonexistent

[Terence Parr]

Ok, we have an important choice to make. Thanks to Bill Venners were  
bringing this up last year. It's important enough and long enough that  
I added to my blog:

http://tinyurl.com/parrt-on-null-attributes

Here is my summary from the bottom of the page:

> Ok, I think I just convinced myself that we'll allow null-valued  
> attributes and that we will treat them differently than missing  
> attributes. Secondly, null option only applies to present but null- 
> valued attributes.

Is it just me or am I cranking through the reimplementation of ST? The  
only thing that slows me down is thinking hard about the quirks of v3.

Ter