The xml parser comes with 
use Spreadsheet::ReadSXC qw(read_xml_string);

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My file:///C:/Perl/html/site/lib/Spreadsheet/ReadSXC.html suggests this
use Unicode::String qw(utf8);
print utf8(" '$cell_contents'")->as_string;

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That correctly forces most of the file that seems to be in latin-1 into UTF-8, at least for the lower code points, for example 
Rougequeue de Güldenstädt   =>     'Rougequeue de Güldenstädt'

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But it fails on the higher code points e.g. "'" in latin-1 does not (unsurprisingly) turn into RIGHT SINGLE QUOTATION MARK (8217 )
Instead, the latin-1 turns into this 
Güldenstädt's Redstart   =>     'Güldenstädt's Redstart'

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which does not equal the name of the same bird in the UTF-8 coded file
Richard H

In reply to Re^4: One bird, two Unicode names by Anonymous Monk
in thread One bird, two Unicode names by RCH

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