Member State LDT Appstore
What does a Member State LDT Appstore consist of?
A Member State LDT Appstore consists of connected building blocks: a catalogue layer, an interoperability and quality layer, a governance and trust layer, and a federation and integration layer—supported by operational processes.
1) Catalogue layer: what you publish and how it can be found
Asset types offer
- Data products: datasets and data APIs, including geodata
- Service products: data services and geo/web services
- Model products: simulation, optimisation and AI models as a service
- Visualisation & interaction: dashboards, 3D viewers, scenario boards
- Workflows/recipes: repeatable chains/pipelines that combine components
- Registries & vocabularies: glossaries, code lists, mappings and reference lists
Metadata model machine-readable
- Separation between the catalogue record lifecycle/governance and the catalogued resource the item itself.
- Based on DCAT/DCAT-AP; for geospatial assets often aligned with GeoDCAT-AP/INSPIRE.
Product page/UX
- Translates metadata into decision information: “what can I do with this?”, conditions, limitations, contact/support, dependencies and implementation instructions.
2) Interoperability and quality layer: from “findable” to “usable”
- Conformance & test results: automatic checks, for example OGC API conformance classes, and recording results as trust signals.
- Semantic interoperability: shared vocabularies, mappings and reference registries so that indicators and definitions remain consistent.
- Version management & lifecycle: status, changelog, deprecation policy, dependencies and compatibility of workflows/services.
- Data quality profiles completeness, timeliness, accuracy
- Provenance/lineage origin, processing, validations
- Reproducibility of models and scenarios inputs, parameter sets, reference cases
3) Governance and trust layer: who may do what, under which rules
- Roles & responsibilities: at minimum Provider, Curator, Steward, Operator and Consumer, including incident, escalation and deprecation processes.
- Assurance levels tiers, proportional and scalable:
- Tier 0: self-declared + basic validations
- Tier 1: curated + basic conformance tests + clear provenance/licence
- Tier 2: independently verified + security posture + reproducibility + where relevant risk documentation
- Legal & policy: licences/user rights, access classes open/registered/contractual, privacy/GDPR artefacts where needed, and for AI: transparency and risk documentation.
- Access and authorisation policy RBAC/ABAC, logging and audit trail
- Security baseline encryption, key management, incident response
- Complaints and objection route and governance for changes to the rules
4) Federation and integration layer: nationally usable, European scalable
- Federation patterns: harvesting, distributed query or hybrid—for “no-wrong-door discovery” local/national/EU.
- Trust/federation services linked to data spaces: identity/attestation, policy enforcement, logging/auditability often through existing building blocks rather than “inside the Appstore itself”.
- Relationship with the EU LDT Toolbox: the Appstore acts as a trusted catalogue layer that describes and makes toolbox-aligned components discoverable, including reference implementations and workflows.
- Connection with national registers and identifiers, for example object IDs
- API gateway/policy gateway for uniform access and throttling
- Cross-border metadata harmonisation multilingualism, minimum metadata set
5) Operational processes: so it works as an ecosystem
- Onboarding pipeline: pre-submission guidance → automatic metadata validation → curator review Tier 1+ → conformance tests → publication → monitoring/feedback.
- Monitoring & feedback loops: uptime/link checks, user experiences, issue reporting and KPIs such as time-to-integrate and reuse rate
- Change management version policy, impact analysis, communication
- Adoption and community process guidelines, example implementations, training
- Portfolio steering prioritisation of assets and gaps based on national challenges
In summary: one shared reality, organised at scale
The Member State LDT Appstore enables reuse by combining discoverability, comparability and trust. twinlink.eu safeguards the prerequisite: fair rules and governance that allow regional parties to manage one shared reality. Once that foundation is in place, Regional SPoT and Common Workspace make it practically executable – and create an ecosystem in which chain partners can collaborate based on the same reliable information and connected processes.