Fix numeric parsing

Julien LepillerWed Apr 01 23:49:49+0200 2020

bc76393

guile-rdf/rdf
namelast commitdate
rdf.scmInitial commitTue Mar 31 04:36:06+0200 2020
xsd.scmInitial commitTue Mar 31 04:36:06+0200 2020