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$ alias perlu
alias perlu='perl -Mstrict -Mwarnings -Mautodie=:all -Mutf8 -C -E'

...
<description>Feed from a to &#xC3;&#xB6;</description>
...
<title>abc...&#xC3;&#xA5;&#xC3;&#xA4;&#xC3;&#xB6;</title>
...

...
<description>Feed from a to &#xF6;</description>
...
<title>abc...&#xC3;&#xA5;&#xC3;&#xA4;&#xC3;&#xB6;</title>
...

$ perlu 'say chr hex "F6"'
ö

my $entry = XML::Feed::Entry->new();

my $entry = XML::Feed::Entry->new('RSS');

...
<description>Feed from a to &#xF6;</description>
...
<title>abc...&#xE5;&#xE4;&#xF6;</title>
...

$ perlu 'say chr hex for qw{E5 E4 F6}'
å
ä
ö