hz MkIV

[Steffen Wolfrum <context@st.estfiles.de>]

Hi,

in MkIV hz is bound to the found (thus the speed increase).

Now, how do I assign different degrees of hz to different areas?
Say, moderate hz in the normal text and more drastic in controlled  
situation, like this:

% main text:
\setupbodyfont[postscript,10pt]
\setupalign[block,hanging,hz]

% and in controlled situation:
\setupwhatever[align=hzXXL,style=...]


This doesn't work:

fonts.expansions.classes['NormalQuality'] = {
     stretch = 1, shrink = 1, step = .5, vector = 'default', factor = 1
}

fonts.expansions.classes['DrasticQuality'] = {
     stretch = 2, shrink = 2, step = .5, vector = 'default', factor = 1
}


\definefontfeature[hz][default] 
[protrusion=pure,expansion=sstquality,mode=node,script=latn]
\definefontfeature[hzXXL][default] 
[protrusion=pure,expansion=sstquality,mode=node,script=latn]

\usetypescript[postscript]
\definetypeface[postscript][rm][serif][times][default][features=hz]%  
<- what to do with hzXXL ???


Steffen
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