zdbpydra is a Python package and command line utility that allows to access JSON-LD data (with PICA+ data embedded) from the German Union Catalogue of Serials (ZDB) via its Hydra-based API (beta).

pip install zdbpydra

# fetch metadata of serial title
zdbpydra --id "2736054-4"

# fetch metadata of serial title (pica only)
zdbpydra --id "2736054-4" --pica

# query metadata of serial titles (cql-based)
zdbpydra --query "psg=ZDB-1-CPO"

# print help message
zdbpydra --help

usage: zdbpydra [-h] [--id ID] [--query QUERY] [--scroll [SCROLL]]
                [--stream [STREAM]] [--pica [PICA]] [--pretty [PRETTY]]

Fetch JSON-LD data (with PICA+ data embedded) from the German Union Catalogue
of Serials (ZDB)

optional arguments:
  -h, --help         show this help message and exit
  --id ID            id of serial title (default: None)
  --query QUERY      cql-based search query (default: None)
  --scroll [SCROLL]  scroll result set (default: False)
  --stream [STREAM]  stream result set (default: False)
  --pica [PICA]      fetch pica data only (default: False)
  --pretty [PRETTY]  pretty print output (default: False)

import zdbpydra
# fetch metadata of serial title
serial = zdbpydra.title("2736054-4")
# fetch metadata of serial title (pica only)
serial_pica = zdbpydra.title("2736054-4", pica=True)
# fetch result page for given query
result_page = zdbpydra.search("psg=ZDB-1-CPO")
# fetch all result pages for given query
result_page_set = zdbpydra.scroll("psg=ZDB-1-CPO")
# iterate serial titles found for given query
for serial in zdbpydra.stream("psg=ZDB-1-CPO"):
    print(serial.title)

See Hydra: Hypermedia-Driven Web APIs by Markus Lanthaler for more information on Hydra APIs in general.

Have a look at the API documentation and CQL documentation (both in german) for more information on using the ZDB JSON interface. For details regarding the LD schema, see the local context file.

Information on the PICA-based ZDB-Format can be found in the corresponding cataloguing documentation or in the PICA+/PICA3 concordance (both in german).

All metadata in the German Union Catalogue of Serials is available free of charge for general use under the Creative Commons Zero 1.0 (CC0 1.0) license. Most of the holding data in the ZDB is also freely available. A corresponding tag is incorporated into the data record itself. (Source)