Grid jobs are failing when trying to access the gdml schema. 'http://service-spi.web.cern.ch/service-spi/app/releases/GDML/schema/gdml.xsd' On grid one can not assume that access to the internet is guaranteed due to firewall settings etc. The schema is part of the general geant 4 distributions so it would be nice to point to the local files by default which would make geant 4 jobs self sufficient.
It is possible to disable schema validation in GDML by setting the proper flag in the parser when reading. This way no access to the network is done.