BBK web service non-standard behaviour

[khaeru]

This issue exists to track non-standard behaviour of the BBK web service.

1. The service requires a non-standard /metadata path in the URL for non-data endpoints; i.e. data queries are from

   https://example.com/base-url/data/…
   

   but e.g. codelist queries must use:

   http://example.com/base-url/metadata/codelist/…
   

   • Work around using the .source.bbk.Source class.

2. The service does not properly handle the "version" path component for non-data endpoints.

   • Work around using the .source.bbk.Source class.

3. Malformed URNs. Returned SDMX-ML documents include content like:

   urn:sdmx:org.sdmx.infomodel.codelist=BBK:CLA_BBK_COLLECTION(1.0)
   

   These URNs include the "package" component (here codelist) but are malformed because they omit the "class" component (should be .Codelist):

   urn:sdmx:org.sdmx.infomodel.codelist.Codelist=BBK:CLA_BBK_COLLECTION(1.0)
   

   • Mention in the sdmx1 documentation.
   • Contact the web service operators to notify them of this error.

[bwedl]

Hi @khaeru,
Is it possible that:

bbk = sdmx.Client("BBK")
flow_msg = bbk.dataflow()

fails due to similar quirks of the BBK endpoint?
It seems that the trailing /all/ in:
https://api.statistiken.bundesbank.de/rest/metadata/dataflow/BBK/all/
is causing a 404.

While https://api.statistiken.bundesbank.de/rest/metadata/dataflow/BBK/ seems to work as expected.

Any chance this could be worked around too?

[khaeru]

Yes, that seems correct. One way to work around in code is:

from pathlib import Path

import requests
import sdmx

BBK = sdmx.Client("BBK")

# Use dry_run to get a prepared requests.Request object;
# then strip off the last component for the desired URL
url = BBK.dataflow(dry_run=True).url.rstrip("all/")

# Query this URL, store in a temporary file
path = Path("temp.xml")
path.write_text(requests.get(url).text)

# Read from the temporary file
msg = sdmx.read_sdmx(path)