Took me a while but I was able to do it for you 
use XML::Xpath::Extract;
my $extractor = XML::Xpath::Extract->new(
    xsd => ['fileA.xsd','fileB.xsd']
);
my $xpaths = $extractor->extract;

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In reply to Re: Extracting Xpths from XML schema by Anonymous Monk
in thread Extracting Xpths from XML schema by ritvik_raj2012

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