The RCE (Rijksdienst voor het Cultureel Erfgoed) provides a SPARQL endpoint is documented at https://linkeddata.cultureelerfgoed.nl/home

See for example:

https://data.pdok.nl/sparql#query=SELECT+*+%7B%0A++%3Fa+%3Chttps%3A%2F%2Flinkeddata.cultureelerfgoed.nl%2Fdef%2Fceo%23heeftBAGRelatie%3E+%3Fc+.%0A++%3Fc+%3Fd+%3Fe+.%0A++%23%3Fx+%3Fy+%3Fa+.%0A++++%7D+LIMIT+1000&contentTypeConstruct=text%2Fturtle&contentTypeSelect=application%2Fsparql-results%2Bjson&endpoint=https%3A%2F%2Flinkeddata.cultureelerfgoed.nl%2Fsparql&requestMethod=POST&tabTitle=Gedefinieerde+klassen&headers=%7B%7D&outputFormat=table

It integrates with the bag and other things. We could setup some reports of incorrect data, import missing monuments, etc. Much better that than in T208127