website xsl: unused variable (and chunking question)

Hello, All!

1.
In website.xsl from Website XSL stylesheets, inside
<xsl:template match="webpage">
variable $filename calculated but not used.

2.
I write (not finished) customization layer for Website which
allow publications for big DocBook documents (<book/>, <set/>
etc). For it I use chunking code from DocBook XSL Stylesheets.

Please, tell me, why Website doesn't support chunking and
elements for big documents ?

-- 
Regards, Vyt
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