Noted that mainEntity is subPropertyOf the about property. Fixes #1681
Noted that mainEntity is subPropertyOf the about property.
Fixes #1681

tfrancart/schemaorg,dbs/schemaorg,vholland/schemaorg,unor/schemaorg,schemaorg/schemaorg,unor/schemaorg,schemaorg/schemaorg,unor/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg,tfrancart/schemaorg,schemaorg/schemaorg,dbs/schemaorg,dbs/schemaorg,vholland/schemaorg,vholland/schemaorg,tfrancart/schemaorg,tfrancart/schemaorg,dbs/schemaorg,vholland/schemaorg