Conditional indentation?

I'm using XSLT to produce HTML from XML for my
website.  I transform locally, then FTP the result to
the server.  When checking over the results of the
transform, I'd like to use

<xsl:output method='html' indent='yes'/>

but to save space in the final result, I'd like to
use:

<xsl:output method='html' indent='no' />

I tried setting a parameter to the stylesheet and then
using:

<xsl:output method='html' indent='{$indent}' />

but the indent attribute is not an attribute value
template.  First question: why not?  Why aren't all
attributes AVTs?  It isn't hard to check for the
presence of a brace, so there's little overhead when
literal values are used (as they will be almost all
the time).

I tried creating two small stylesheets, with just
those <xsl:output> elements in them, and then
including them:

<xsl:include href='{$outputsheet}' />

But again, the href attribute is not an AVT.

Is there any way to accomplish what I want?  Am I
overlooking something simple?

--Ned.


=====
Ned Batchelder, http://www.nedbatchelder.com

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