[xsl] text replacement with mixed content

[Geert Bormans <geert@xxxxxxxxxxxxxxxxxxx>]

Hi all,

thanks for reading this.

I have an interesting task.

All through a document I need to replace each occurrence of "my foo" 
with "<replaced>your bar</replaced>"
But the texts contain mixed content tags, so I might as well find "my 
<bold>foo</bold>" that needs to become "<replaced>your bar</replaced>" as well

Note that the I need to keep the tags balanced, so I must not end up 
with "<replaced>your bar</replaced></bold>" in the later case

I have some algorithms in mind, but I am not happy with any of them.
So I thought I might as well ask here, hoping one of you can come up 
with something really elegant

the replacement tags are pulled out of another document,
so as a bonus, the text to be replaced could be "my.foo", requiring 
me likely to build correct regexes automatically

so, thanks in advance for your help

Geert