Matching the DCAT-AP.de recommendations, interpret MD_Metadata/dateStamp as modified instead of issued.
The matches the advice given at https://www.dcat-ap.de/def/dcatde/2.0/implRules/#erkennung-von-dubletten.
The matches the advice given at https://www.dcat-ap.de/def/dcatde/2.0/implRules/#erkennung-von-dubletten.