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Data interoperability#

Part of the LDT Governance and Trust Framework — instantiates the iSHARE Data Space Template pillar Data Interoperability (© iSHARE Foundation, see Legal notices).

Purpose#

For a data space to function, people and systems must interpret shared data the same way. That has two sides: semantic interoperability — agreeing what a term means — and technical interoperability — agreeing on syntax, formats and interfaces. On top of that sits the evidence question: where data came from, how it has been used and by whom, which is what provenance and traceability provide for auditing and regulated use.

LDT instantiation — where we stand#

The LDT interconnects twins that were not built to a common model: two city twins, an airport and a port, on different stacks. The scheme therefore does not mandate one canonical twin model. Instead it fixes the boundary:

  • Common semantics apply to what crosses between twins — indicators, emissions figures, locations, time — not to each twin's internals. Alignment targets are the iSHARE vocabulary for scheme-level concepts and established domain models for the rest; see Data models.
  • Every cross-twin flow is exchanged over a documented, open interface and is subject to the scheme's enforcement layer; see Data exchange.
  • Where a figure is used as evidence — a CO₂ saving, a policy effect, a token issuance — provenance is not optional; see Provenance, traceability & observability.

That third point is the one most likely to be underestimated: the Marketplace of the EU LDT Toolbox and the CO₂ tokenisation service turn twin outputs into claims with financial consequences, and a claim without provenance cannot be audited.

Blocks in this pillar#

# Block Owner(s) Status
T1 Data models · guiding questions iLabs + LogiNex + cities OPEN
T2 Data exchange · guiding questions iLabs OPEN
T3 Provenance, traceability & observability · guiding questions iLabs + iSHARE OPEN

PD4 mapping#

Feeds PD4 chapter 5 (data & data-model sharing) and chapter 7 (assurance, compliance & operations).