geocardo 0.0.0

OGC API building blocks for Python. Conformance first. By design. Only async.

geocardo

Conformance first. By design. Only async.

OGC API building blocks for Python. Conformance isn't a goal — it's a structural property.

Status

🚧 Pre-alpha — under active design. APIs are unstable. v0.1 is being built. See docs/architecture/roadmap.md for the plan.

What is this

geocardo is an async-native, framework-agnostic Python library for building OGC API services. The OGC specifications themselves are the foundation: a Rust catalog parses the official OGC OpenAPI documents and compiles them into a binary the Python layer queries at runtime. Everything else — domain model, configuration, OpenAPI generation — derives from that catalog.

You write filterable = true. geocardo maps your intent to the right OGC specification, verifies your provider supports it, generates the conformant OpenAPI, and validates everything at startup.

Why

Two roads exist today for OGC API in Python:

• pygeoapi — a configurable server. Conformance is declarative. I/O is synchronous.
• Custom code — reinvent content negotiation, pagination, link building. Conformance sacrificed to deadlines.

geocardo is a third road: a library, not a server. Async-native. Conformance by construction.

Foundational principles

• Conformance first — if it can't be conformant, it isn't exposed.
• By design — the OpenAPI is built, not pruned. Conformance classes are calculated, not declared.
• Only async — composes natively with TiPG, Titiler, Obstore, asyncpg, and the rest of the Python/Rust async ecosystem.

Architecture

Domain-Driven Design with Hexagonal architecture (Ports & Adapters). Python for the domain and orchestration. Rust for hot paths: specification catalog, CQL2 parsing, JSON Schema validation, GeoJSON serialization.

See docs/architecture/ for the full design and the ADR series.

Quick start

🚧 Not yet — v0.1 is the first usable milestone. Star the repo to follow progress.

For contributors wanting to build from source now, see CONTRIBUTING.md. Short version:

git clone https://github.com/francbartoli/geocardo.git
cd geocardo
uv sync          # installs Python, deps, builds the Rust extension
uv run pytest    # verifies the build

Project context

This is a personal project by Francesco Bartoli. It complements rather than replaces pygeoapi.

Contributing

See CONTRIBUTING.md. Read the ADRs in docs/architecture/ before making non-trivial changes.

License

MIT — see LICENSE.