Triplestore wrapper for Python providing a simple and consistent interface to a range of triplestore backends

Tripper

Getting started

• Tutorial
• Documentation
• Reference manual

Basic concepts

Tripper provides a simple and consistent interface to a range of triplestore backends. It strives for simplicity and is modelled after rdflib (with a few simplifications).

In Tripper:

• All IRIs are represented by Python strings. Example: https://w3id.org/emmo#Metre

• Blank nodes are strings starting with _:. Example: _:bnode1

• Literals are constructed with tripper.Literal. Example: tripper.Literal(3.14, datatype=XSD.float)

To make it easy to work with IRIs, provide Tripper a set of pre-defined namespaces, like XSD.float. New namespaces can be defined with the tripper.Namespace class.

A triplestore wrapper is created with the tripper.Triplestore class.

Sub-packages

Additional functionality beyond interfacing triplestore backends is provided by specialised sub-package:

• tripper.datadoc: An API for data documentation.
• tripper.units: Working with units and quantities defined in ontologies.
• tripper.mappings: Traverse mappings stored in the triplestore and find possible mapping routes.
• tripper.convert: Convert between RDF and other data representations.

Available backends

The following backends are currently available, either in Tripper or other packages.

Installation

Tripper has by itself no dependencies outside the standard library, but the triplestore backends may have specific dependencies.

The package can be installed from PyPI using pip. A minimal installation can be done with

pip install tripper

but typically, you would also like to install the requirements needed by the backends, the tripper sub-packages and extra features. The requirements for the backends are listed in the table above, while sub-packages and extra features are enabled by specifying one or more of the "extras" listed in the table below when installing Tripper.

For example, the following command will install Tripper with the tripper.datadoc sub-package and the rdflib backend enabled:

pip install tripper[datadoc] rdflib

Developers should install Tripper with the dev extras and enable pre-commit:

pip install tripper[dev]
pre-commit install  # Enable pre-commit and installing hooks

License and copyright

All files in this repository are licensed under the MIT license. If not stated otherwise in the top of the files, they have copyright © 2022 SINTEF.

Acknowledgements

We gratefully acknowledge the following projects for supporting the development of Tripper:

• OntoTrans (2020-2024) that receives funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement n. 862136.
• OpenModel (2021-2025) that receives funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement n. 953167.
• SFI PhysMet (2020-2028) funded by Forskningsrådet and Norwegian industry partners.
• DOME 4.0 (2021-2025) that receives funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement n. 953163.
• VIPCOAT (2021-2025) that receives funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement n. 952903.
• MEDIATE (2022-2025) that receives funding from the RCN, Norway; FNR, Luxenburg; SMWK Germany via the M-era.net programme, project 9557,
• MatCHMaker (2022-2026) that receives funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement n. 101091687.
• PINK (2024-2027) that receives funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement n. 101137809.