What is this?
This is the public, read-only API for the PTPGE Standard — the open reference for the printing industry, built as a structured vocabulary. Every term has a permanent URI, a definition, and SKOS-compatible relationships. Free to use under CC BY 4.0 with attribution.
Try it
The current version is at /v1/. Some example URLs to explore:
- /v1/ — API discovery document
- /v1/scheme — the concept scheme (two top concepts)
- /v1/version — version & statistics
- /v1/printing — the Printing Process top concept (industry view)
- /v1/printing/standards — Printing Process · Standards Group
- /v1/printing/standards/color-systems/color-spaces/cmyk — a leaf element with full definition
- /v1/ordering — the Ordering Process top concept (end-user view)
- /v1/ordering/products — Ordering Process · Products Group
From the command line
curl https://api.ptpge.org/v1/scheme curl https://api.ptpge.org/v1/printing/standards/color-systems/color-spaces/cmyk curl https://api.ptpge.org/v1/ordering/products curl https://api.ptpge.org/v1/version
Format
All responses are JSON-LD — both human-readable JSON and a valid RDF graph. The JSON-LD context maps PTPGE-specific field names to standard SKOS and Dublin Core vocabularies, so the same data can be consumed by both plain HTTP clients and semantic-web tools (Skosmos, Protégé, Apache Jena, RDFLib, …) without any transformation step.
Compatibility option for plain JSON clients. Some tools and HTTP
libraries don't recognise application/ld+json as JSON. Append
?format=json to any endpoint to receive the same payload with
Content-Type: application/json instead — e.g.
/v1/scheme?format=json.
Documentation
For developers integrating PTPGE Standard into a marketplace, MIS / ERP, AI agent, or custom application, start with the Integration Guide — it covers integration patterns, code examples, best practices, versioning, and the full API reference.
Full conceptual reference, layer model, SKOS mapping, and contributor guidelines are on the PTPGE Status Dashboard (internal access). The Standard's sources are maintained in the canonical PTPGE repository.
Stability promise
Once a term is published, its URI is permanent. Approved terms are never deleted; they may only be deprecated, and deprecated URIs continue to resolve forever. See the PTPGE Four-Layer Model for the full guarantees and what is/isn't covered.