CI: check the validity of the RDFa file (#1722)
CI: check the validity of the RDFa file (#1722)


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