my $epubXSL = 'common/xsl/epub-xhtml.xsl';
my $metadataXSL = 'common/xsl/epub-opf-metadata.xsl';
my $spineXSL = 'common/xsl/epub-opf-spine.xsl';
my $epubXSL = 'common/xsl/epub-xhtml.xsl';
my $metadataXSL = 'common/xsl/epub-opf-metadata.xsl';
my $spineXSL = 'common/xsl/epub-opf-spine.xsl';