Add prov:startAtTime, prov:endedAtTime and sdo:duration as slots to Activity class #46
Description
It seems wise to add also https://www.w3.org/TR/prov-o/#startedAtTime, https://www.w3.org/TR/prov-o/#endedAtTime and https://schema.org/duration as optional slots to the Activity in the script that generated the dcat_ap_plus.yaml. This way all Activity subclasses in DCAT-AP-PLUS, but most importantly also in the planned extensions using it, would be described regarding their start, end and duration allways in the same way.