Package: docbook5-style-xsl

"docbook5-style-xsl" package binaries on CentOS:

/usr/share/sgml/docbook/xsl-ns-stylesheets-1.75.2/epub/bin/dbtoepub /usr/share/sgml/docbook/xsl-ns-stylesheets-1.75.2/epub/bin/lib /usr/share/sgml/docbook/xsl-ns-stylesheets-1.75.2/epub/bin/lib/docbook.rb /usr/share/sgml/docbook/xsl-ns-stylesheets-1.75.2/tools/bin/docbook-xsl-update

You may install this package on CentOS with yum install docbook5-style-xsl