Revert "Add properties belongsTo, barcode & fix rdfs -> null"
Revert "Add properties belongsTo, barcode & fix rdfs -> null"

This reverts commit 59da2de594abd7d85cc82adef208838c543cb5b7.

digibib/ls.ext,digibib/ls.ext,digibib/ls.ext,digibib/ls.ext