# Generated by API Evangelist (pipeline-university) from live probes of the institution's own hosts.
# Politecnico di Milano — surface lifecycle and change signals
---
lifecycle: '0.1'
provider: politecnico-di-milano
generated: '2026-09-01'
method: probed
source:
  - https://www.opendata.polimi.it/opendata_polimi.ttl
  - https://re.public.polimi.it/oai/request?verb=Identify
  - https://www.politesi.polimi.it/oai/request?verb=Identify
  - https://shibidp.polimi.it/idp/shibboleth
  - https://re.public.polimi.it/sitemap
surfaces:
  - surface: Open data portal
    versioning: none
    change_signal: >-
      dct:modified per dataset inside the DCAT catalogue (course_catalog carries 2025-11-11) and
      dct:modified 2024-10-18 on the catalogue itself; dct:accrualPeriodicity is declared per dataset
      (course_catalog: ANNUAL, using the EU frequency authority vocabulary).
    issued: '2023-10-30'
    deprecation_policy: none published
    detail: >-
      Distribution URLs are unversioned and stable; a consumer detects change by re-reading the catalogue's
      dct:modified, not by a version number or a changelog. There is no release feed and no notice channel.
  - surface: IRIS Re.Public@Polimi OAI-PMH
    versioning: protocol
    protocol_version: '2.0'
    change_signal: >-
      Per-record datestamps with YYYY-MM-DDThh:mm:ssZ granularity plus from/until selective harvesting —
      the standard incremental-harvest mechanism. earliestDatestamp 2015-06-10T07:10:04Z. deletedRecord
      "transient", so deletions are NOT reliably reported and a harvester cannot assume tombstones persist.
      Sitemap index at /sitemap refreshed daily (lastmod 2026-09-01T06:20:26Z on all four maps).
    deprecation_policy: none published
  - surface: POLITESI OAI-PMH
    versioning: protocol
    protocol_version: '2.0'
    change_signal: >-
      Per-record datestamps and from/until, earliestDatestamp 2010-08-24T12:39:32Z, deletedRecord transient.
    deprecation_policy: none published
  - surface: Shibboleth IdP metadata
    versioning: none
    change_signal: >-
      Key rotation is the change signal — the metadata carries a dated comment on the current certificate
      ("CERTIFICATO VALIDO DAL 25/05/2025 AL 18/05/2040") and the entity is republished through the IDEM
      GARR aggregate, which federation members refresh on their own schedule.
    deprecation_policy: federation-managed
overall:
  status_page: none found
  changelog: none found
  developer_notice_channel: none found
  detail: >-
    No institution-operated surface publishes a status page, changelog, deprecation policy or notice
    channel. Change is discoverable only by re-reading the artifacts themselves.