nexusustils is a tool designed for making your experimental data FAIR. It allows to develop ontologies and to create ontological instances based on the NeXus format.

Installation

It is recommended to use python 3.8 with a dedicated virtual environment for this package. Learn how to manage python versions and virtual environments.

Install this package with

pip install git+https://github.com/nomad-coe/nomad-parser-nexus.git

for the latest development version.

Scope

nexusustils is intended as a parser for combining various instrument output formats and electronic lab notebook (ELN) formats to an hdf5 file according to NeXus application definitions.

Additionally, the software is used in the research data management system NOMAD for making experimental data searchable and publishable. NOMAD is developed by the FAIRMAT consortium, as a part of the German National Research Data Infrastructure (NFDI).

The software tools are located inside pynxtools and they are shipped with unit tests located in tests. Some examples with real datasets are provided in examples. It guides you through the process of converting instrument raw data into the NeXus standard and visualising the files content.

Command line tools

• nyaml2nxdl: Converts, easy to read, YAML NeXus schemas into NeXus XML definition language (NXDL).
• dataconverter: Creates compliant instances of NeXus/HDF5 files to NeXus schemas.
• read_nexus: Outputs a debug log for a given NeXus file.

Contributing

Development install

Install the package with its dependencies:

git clone https://github.com/nomad-coe/nomad-parser-nexus.git \\
    --branch master \\
    --recursive pynxtools
cd pynxtools
git submodule sync --recursive
git submodule update --init --recursive --jobs=4
python -m pip install --upgrade pip
python -m pip install -e .
python -m pip install -e ".[dev]"

Test this software

Especially relevant for developers, there exists a basic test framework written in pytest which can be used as follows:

python -m pytest -sv tests

Questions, suggestions?

To ask further questions, to make suggestions how we can improve these tools, to get advice on how to build on this work, or to get your parser included into NOMAD, you can:

• Open an issue on the pynxtools GitHub
• Use our forums at matsci.org
• Write to support@nomad-lab.eu
• Contact directly the lead developers of the individual parsers.

Does this software require NOMAD or NOMAD OASIS ?

No. The data files produced here can be uploaded to Nomad. Therefore, this acts like the framework to design schemas and instances of data within the NeXus universe.