[xsl] problem with whitespace in mixed content (reverse indentation)

Hello,

I have a problem with whitespace in mixed content to which I cannot find 
the solution. I am hoping that one of you can help me.
Due to imprudent use of indent="yes" on <xsl:output>, the whitespace in 
the mixed-content elements of my data got messed up. I'll best explain 
the problem with an example.
The following original data

<text><i>Italicized</i> normal <i>italicized</i> <b>bold</b> 
<i><b>italicized and bold</b></i>.</text>
now looks like this:

<text>
   <i>Italicized</i> normal <i>italicized</i>
   <b>bold</b>
   <i>
      <b>italicized and bold</b>
   </i>.</text>

I have found out how to avoid the indentation in mixed-content elements 
in the future, namely by using saxon:suppress-indentation. My question 
is how I can return the modified data back to its original form, i.e., 
reverse the indentation. The task can be formulated thus: In <text> 
elements, whitespace-only text nodes that are situated between two start 
tags should be eliminated, while whitespace-only text nodes that are 
situated between an end tag and a start tag should be replaced by a 
single space. How can that be done?
I know that I can select whitespace-only text nodes with 
test="matches(.,'^\s+$')". But how can I test whether the preceding tag 
is a start tag or an end tag?
Thanks in advance for your help!

Wolfhart
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