*PID examples: doi:10.4232/1.0068, https://api.forschungsdaten-bildung.de/v1/studies/269,
https://search.gesis.org/research_data/ZA5667
*RDC ID exmples: all, RDC-001, RDC-002, RDC-003, RDC-004
*FDO Service ID exmples: all, FDS_COUNT_VIDEO
*Invoke FDO Service examples:
FDO Service: FDS_GET_RAW_DATA
CSV raw data PIDs: https://search.gesis.org/research_data/ZA5667
MP3 raw data PID: https://api.forschungsdaten-bildung.de/v1/studies/142
MPEG raw data PID: https://api.forschungsdaten-bildung.de/v1/studies/999
FDO Service: FDS_SIGNPOSTING, PID: 10.4232/1.0068
*Study ID examples: ZA0065_SU, 269, ZA5667
*Create FDO example: {"type" : "Study","content" : {"study_id" : "0000100","title" : "Corona Study", "description" :
"This is a Corona study."}}