Contains the development for the Industry 4.0 standards knowledge graph (I40KG). Its current collaborative development is driven by VoCol - http://vocol.iais.fraunhofer.de/sto/
I guess you refer to the fact that the voag.linkedmodel.org server is down (all the time?). I replaced the entities from the voag namespace with own ones and shifted the relation to voag into Literal notes.
The URL http://voag.linkedmodel.org/schema/voag# and http://voag.linkedmodel.org/owl/schema/voag# do not exist