# Introduction (https://eulabel.eu/docs/knowledge-base/overview/introduction)

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Digital Product Passports are a new EU requirement. This Knowledge Base covers the standards, regulations, practical workflows, best practices, and real-world examples behind EUlabel.

Concepts [#concepts]

Understand the standards and architecture behind Digital Product Passports.

- [Digital Product Passports](https://eulabel.eu/docs/knowledge-base/concepts/digital-product-passports) — EU-mandated machine-readable datasets under ESPR
- [ESPR Regulation](https://eulabel.eu/docs/knowledge-base/concepts/espr-regulation) — The legal framework, four-actor model, and identifier requirements
- [DPP Architecture](https://eulabel.eu/docs/knowledge-base/concepts/dpp-architecture) — The six-layer model for DPP systems
- [Sector Timelines](https://eulabel.eu/docs/knowledge-base/concepts/sector-timelines) — When each product category must comply
- [GS1 Digital Link](https://eulabel.eu/docs/knowledge-base/concepts/gs1-digital-link) — The URI standard for web-resolvable product identifiers
- [Data Carriers](https://eulabel.eu/docs/knowledge-base/concepts/data-carriers) — QR codes, Data Matrix, and NFC for DPP
- [The Resolver](https://eulabel.eu/docs/knowledge-base/concepts/resolver) — How one QR scan reaches different audiences
- [Linkset](https://eulabel.eu/docs/knowledge-base/concepts/linkset) — Machine discovery via RFC 9264
- [JSON-LD and schema.org](https://eulabel.eu/docs/knowledge-base/concepts/json-ld-and-schema-org) — Semantic data for interoperability and search
- [Scan Analytics](https://eulabel.eu/docs/knowledge-base/concepts/scan-analytics) — Structured scan events from the resolver
Guides [#guides]

Step-by-step instructions for common tasks and compliance workflows.

- [Wine E-Label](https://eulabel.eu/docs/knowledge-base/guides/wine-e-label) — Create a compliant wine e-label
- [Passport Data Format](https://eulabel.eu/docs/knowledge-base/guides/passport-data-format) — Wine JSON-LD field inventory with regulatory refs
- [Textile DPP (Preview)](https://eulabel.eu/docs/knowledge-base/guides/textile-passport) — Preview the textile passport data model
- [Battery Passport (Preview)](https://eulabel.eu/docs/knowledge-base/guides/battery-passport) — Preview battery passport requirements
- [GTIN Validation](https://eulabel.eu/docs/knowledge-base/guides/gtin-validation) — Validate and normalize GTIN barcodes
- [PIM Integration](https://eulabel.eu/docs/knowledge-base/guides/pim-integration) — Connect your PIM to EUlabel
- [Multi-CMS Sync](https://eulabel.eu/docs/knowledge-base/guides/multi-cms-sync) — Resolve conflicts when syncing from multiple sources
- [API Versioning](https://eulabel.eu/docs/knowledge-base/guides/api-versioning) — Versioning and deprecation policy
- [Idempotency](https://eulabel.eu/docs/knowledge-base/guides/idempotency-and-deduplication) — Hash-based deduplication and safe retries
- [Error Handling](https://eulabel.eu/docs/knowledge-base/guides/error-handling) — Structured errors and retry logic
- [Custom Domains](https://eulabel.eu/docs/knowledge-base/guides/custom-domains) — Branded domains for passports
- [Roles & Permissions](https://eulabel.eu/docs/knowledge-base/guides/roles-and-permissions) — Role-based access control
Best Practices [#best-practices]

Recommended patterns for robust, compliant integrations.

- [Resolver Integration](https://eulabel.eu/docs/knowledge-base/best-practices/resolver-integration) — HTTP semantics, GTIN hierarchy, and testing
- [QR Code Strategy](https://eulabel.eu/docs/knowledge-base/best-practices/qr-code-strategy) — What to print, domain strategy, and testing
- [Compliance Checklist](https://eulabel.eu/docs/knowledge-base/best-practices/compliance-checklist) — Pre-launch checklist for wine e-labels
- [Multi-Audience Design](https://eulabel.eu/docs/knowledge-base/best-practices/multi-audience-design) — Consumers, regulators, recyclers, retailers
Examples and Case Studies [#examples-and-case-studies]

Real-world integration examples.

- [Wine Label End-to-End](https://eulabel.eu/docs/knowledge-base/examples/wine-label-end-to-end) — Complete API-to-label walkthrough
- [Cross-Sector Comparison](https://eulabel.eu/docs/knowledge-base/examples/cross-sector-comparison) — Wine vs textile vs battery DPP
- [PIM-to-Passport Pipeline](https://eulabel.eu/docs/knowledge-base/examples/pim-to-passport-pipeline) — Enterprise integration case study