obsolete positive regulation of heparan sulfate proteoglycan biosynthesis by positive regulation of epimerase activity (obsolete GO:0010910)
OBSOLETE. Any process that increases the rate, frequency or extent of heparan sulfate proteoglycan biosynthesis by an increase in epimerase activity. This epimerase activity catalyzes the reaction that converts D-glucuronate into its diastereoisomer in heparan sulfate.