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Showing content from https://github.com/RDFLib/prez below:

RDFLib/prez: Prez is a data-configurable Linked Data API framework that delivers profiles of Knowledge Graph data according to the Content Negotiation by Profile standard.

Prez is a data-configurable Linked Data API framework that delivers profiles of Knowledge Graph data according to the Content Negotiation by Profile standard.

Where's the UI?

Prez delivers data only - usually RDF but could be GeoJSON, XML etc. - and it delivers a special form of RDF which includes labels for all objects and predicates Prez can find in its database.

If you want a UI that can render Prez' labelled RDF as HTML and other fancy graphical widgets, see the Prez UI.

To get a copy of Prez on your computer, run:

git clone https://github.com/RDFLib/prez

Prez is developed with Poetry, a Python packaging and dependency tool. Poetry presents all of Prez's dependencies (other Python packages) in the pyproject.toml file located in the project root directory.

To install the Python dependencies run:

Note: Poetry must be installed on the system. To check if you have Poetry installed run poetry --version. For tips on installing and managing specific dependency groups check the documentation.

Running a demonstration instance

Docker Compose can be used to run a demonstration instance. The compose files comprises three services: Prez (Prez API), Prez UI, and Fuseki. To run the stack, change directory into the demo directory and run: docker compose up.

The Fuseki instance is empty, but can have data added to it, such as the test data under test_data.

Prez delivers the following endpoints:

Endpoint Default MT / text/anot+turtle /docs text/html /catalogs/{catalogId} text/anot+turtle /catalogs/{catalogId}/collections text/anot+turtle /catalogs/{catalogId}/collections/{recordsCollectionId} text/anot+turtle /catalogs/{catalogId}/collections/{recordsCollectionId}/items text/anot+turtle /catalogs/{catalogId}/collections/{recordsCollectionId}/items/{itemId} text/anot+turtle /purge-tbox-cache application/json /tbox-cache application/json /health application/json /prefixes text/anot+turtle /concept-hierarchy/{parent_curie}/narrowers text/anot+turtle /concept-hierarchy/{parent_curie}/top-concepts text/anot+turtle /cql text/anot+turtle /profiles text/anot+turtle /search text/anot+turtle /profiles/{profile_curie} text/anot+turtle /object text/anot+turtle /identifier/redirect N/A /identifier/curie/{iri} text/plain /identifier/iri/{curie} text/plai OGC Features API Endpoints

The OGC Features API Endpoints are based at the ROOT /catalogs/{catalogId}/collections/{recordsCollectionId}/

Endpoint Default MT {ROOT}/features application/json {ROOT}/features/docs text/html {ROOT}/features/conformance application/json {ROOT}/features/collections application/json {ROOT}/features/collections/{collectionId} application/json {ROOT}/features/collections/{collectionId}/items application/geo+json {ROOT}/features/collections/{collectionId}/items/{featureId} application/geo+jso

The following Environment Variables can be used to configure Prez: In most cases all that is required is the SPARQL_ENDPOINT variable.

These can be set in a '.env' file which will get read in via python-dotenv. Alternatively, set them directly in the environment from which Prez is run.

An example .env file with the minimum required variables is in the repo as .env-required-template, and an example .env file with all possible configuration variables, showing defaults, is in the repo as .env-full-template.

SPARQL Endpoint Configuration

SPARQL_ENDPOINT: Read-only SPARQL endpoint for Prez. Default is None.
SPARQL_USERNAME: A username for the Prez SPARQL endpoint, if required by the RDF DB. Default is None.
SPARQL_PASSWORD: A password for the Prez SPARQL endpoint, if required by the RDF DB. Default is None.
ENABLE_SPARQL_ENDPOINT: Whether to enable the SPARQL endpoint. I.e. whether prez exposes the remote repository's SPARQL endpoint (typically a triplestore). Default is False. NB the SPARQL endpoint when enabled supports POST requests. Prez itself does not make any updates to the remote repository (e.g. the remote Triplestore), however, if the remote SPARQL endpoint is enabled it is then possible that users can make updates to the remote repository using the SPARQL endpoint.

PROTOCOL: The protocol used to deliver Prez. Default is "http".
HOST: Prez's host domain name. Default is "localhost".
PORT: The port Prez is made accessible on. Default is 8000.

SYSTEM_URI: An IRI for the Prez system as a whole. This value appears in the landing page RDF delivered by Prez ("/"). Default is f"{protocol}://{host}:{port}".

LOG_LEVEL: Logging level. Default is "INFO".
LOG_OUTPUT: Logging output destination. Default is "stdout".

PREZ_TITLE: Title for the Prez instance. Default is "Prez".
PREZ_DESC: Description of the Prez instance. Default is a description of the Prez web framework API.
PREZ_VERSION: Version of the Prez instance. Default is None.

CURIE_SEPARATOR: Separator used in CURIEs. Default is ":". This separator appears in links generated by Prez, and in turn in URL paths.

Used for displaying RDF with human readable labels.

LABEL_PREDICATES: List of predicates used for labels. Default includes:
- skos:prefLabel
- dcterms:title
- rdfs:label
- sdo:name

When an annotated (+anot) mediatype is used, Prez includes triples for every URI in the initial response which has one of the above properties. These annotation triples are then cached. The annotations are used for display purposes, for example HTML pages.

Similar to label predicates above.

DESCRIPTION_PREDICATES: List of predicates used for descriptions. Default includes:
- skos:definition
- dcterms:description
- sdo:description

Similar to provenance predicates above.

PROVENANCE_PREDICATES: List of predicates used for provenance. Default includes:
- dcterms:provenance

The annotation mechanism can further be used to generally return certain properties wherever present.

OTHER_PREDICATES: List of other predicates. Default includes:
- sdo:color
- reg:status
- skos:narrower
- skos:broader

SPARQL Repository Configuration

SPARQL_REPO_TYPE: Type of SPARQL repository. Default is "remote". Options are "remote", "pyoxigraph", and "oxrdflib"
SPARQL_TIMEOUT: Timeout for SPARQL queries. Default is 30.

PREZ_CONTACT: Contact information for Prez. Default is None.

DISABLE_PREFIX_GENERATION: Whether to disable prefix generation. It is recommended to disable prefix generation for large data repositories, further, it is recommended to always specify prefixes in the prez/reference_data/prefixes/ directory. Default is False.

Language and Search Configuration

DEFAULT_LANGUAGE: Default language for Prez. Default is "en".
DEFAULT_SEARCH_PREDICATES: Default search predicates. Default includes:
- rdfs:label
- skos:prefLabel
- sdo:name
- dcterms:title

Used in conjunction with the Pyoxigraph repo. Specifies a directory (from the repository root) to load into the Pyoxigraph in memory data graph. Not used for other repository types.

LOCAL_RDF_DIR: Directory for local RDF files. Default is "rdf".

ENDPOINT_STRUCTURE: Default structure of the endpoints, used to generate links. Default is ("catalogs", "collections", "items").

SYSTEM_ENDPOINTS: List of system endpoints. Default includes:
- ep:system/profile-listing
- ep:system/profile-object

Listing and Search Configuration

LISTING_COUNT_LIMIT: The maximum number of items to count for a listing endpoint. Counts greater than this limit will be returned as ">N" where N is the limit. Default is 100.
SEARCH_COUNT_LIMIT: The maximum number of items to return in a search result. Default is 10.

TEMPORAL_PREDICATE: The predicate used for temporal properties. Default is sdo:temporal.

This section is for developing Prez locally. See the Running options below for running Prez in production.

To run the development server (with auto-reload on code changes):

poetry run python main.py

Prez container images are built using a GitHub Action and are available here.

The Dockerfile in the repository can also be used to build a Docker image.

The image name is ghcr.io/rdflib/prez.

The latest tag points to the latest stable release of Prez. All latest stable releases have a major, major.minor, and major.minor.patch tag pointing to it.

For example, for a release with a git tag of 3.2.4, the following tags will be on the container image:

3
3.2
3.2.4
latest

The full version is automatically created/incremented using the Semantic Release GitHub Action, which automatically increments the version based on commits to the main branch.

Prez uses PyTest and Coverage for testing and test coverage reports.

To run all available tests:

To run all available tests for coverage analysis:

poetry run coverage run -m pytest tests

To generate a coverage report:

poetry run coverage report

As a Linked Data server, Prez provides a redirect service at /identifier/redirect that accepts a query parameter iri, looks up the iri in the database for a foaf:homepage predicate with a value, and if it exists, return a redirect response to the value.

This functionality is useful for institutions who issue their own persistent identifiers under a domain name that they control. The mapping from the persistent identifier to the target web resource is stored in the backend SPARQL store.

This is an alternative solution to persistent identifier services such as the w3id.org. In some cases, it can be used together with such persistent identifier services to avoid the need to provide the redirect mapping in webserver config (NGINX, Apache HTTP, etc.) and instead, define the config as RDF data.

For Prez to deliver data via its various subsystems, the data needs to conform to some minimum requirements: you can't, for instance, run VocPrez without any SKOS ConceptSchemes defined!

All the profiles listed above provide validators that can be used with RDF data to test to see if it's valid. If it is, Prez will be just fine with it.

The profiles' validators are all available from the profiles themselves (navigate to the listings of other profile resources via the specification links above) and they are also loaded into the KurrawongAI SHACL Validator online tool which you can use without downloading or installing anything:

https://tools.dev.kurrawong.ai/validate

Look for the VocPrez Compounded and similar validators. The 'compounded' bit means that validator will validate data against all VocPrez and inherited requirements.

NOTE: This open source tool is actively developed and supported by KurrawongAI, a small Australian Knowledge Graph company, developers at the University of Melbourne and by open source contributors too.

To flag problems or raise questions, please create issues in the Issue Tracker or you can contact developers using their details below.

Here are the lead developers:

KurrawongAI https://kurrawong.ai

David Habgood david@kurrawong.ai

Nicholas Car nick@kurrawong.ai

Edmond Chuc edmond@kurrawong.ai

University of Melbourne - Prez UI mainly Jamie Feiss jamie.feiss@unimelb.edu.au

We love contributions to this tool and encourage you to create Issues in this repository's Issue Tracker or to submit a Pull Requests!

There is documentation on contributing to Prez, see README-Dev.md.

This version of Prez and the contents of this repository are also available under the BSD-3-Clause License. See this repository's LICENSE file for details.

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