violation triggered as observations are omitted

[Rdataflow]

context
fetch-metadata omits the observations (intentially) but unfortunately this leads to a violation down the line applying check-metadata. the fetch & check pipe is expected to behave consistently.

message
Violation of NodeConstraintComponent: "cube:Cube needs an observationSet" with path https://cube.link/observationSet at focus node https://environment.ld.admin.ch/foen/besch_holz_inst_einheit_weniger4/20 (source: _:b88_b710)
Violation of MinCountConstraintComponent: "cube:Cube needs at least one observation" with path https://cube.link/observation at focus node https://environment.ld.admin.ch/foen/besch_holz_inst_einheit_weniger4/20/observation/ (source: _:b88_b712)

steps to reproduce

npx barnard59 cube fetch-metadata \
  --cube https://environment.ld.admin.ch/foen/besch_holz_inst_einheit_weniger4/20 \
  --endpoint https://int.lindas.admin.ch/query \
| npx barnard59 cube check-metadata \
  --profile https://cube.link/latest/shape/profile-visualize \
| npx barnard59 shacl report-summary

cc @giacomociti

[giacomociti]

this is not a surprise, see also #146. Besides turning the violation into a warning (which is my preferred option, simple and effective), other options to address the issue are:

• removing the constraint
• retrieving the observation set and a single observation in fetch-metadata
• deactivating the shape when running check-metadata

[tpluscode]

👍 for making this a warning and also fetching a single observation with fetch-metadata