materia-epd 0.7.3

Generic EPD Aggregator

Generic EPD Aggregator

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Features

• Parse ILCD process and flow XMLs
• Normalize material properties and LCIA modules
• Aggregate impacts and compute weighted averages
• Write new ILCD XML datasets

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Installation

Install via PyPI:

pip install materia-epd

Requires Python 3.10+.

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Usage

Here’s a minimal example:

python -m materia_epd <generic_processes_dir> <epd_processes_dir> -o <output_dir> -v

Note that you need to point to the root processes folders and need to provide a matches folder in the generic data folder to link generic products and EPDs. Add the flag --v or -v for verbosity. Logs files with details will be automatically created in <output_dir>. The <generic_processes_dir> folder should be structured like this:

<generic_process_dir>
├── flows
│   ├── <flow-uuid-1>.xml # Reference flow of EPD-uuid-1
│   ├── <flow-uuid-2>.xml
│   └── ...etc
├── matches
│   ├── <matches-uuid-1>.json # Source EPDs for EPD-uuid-1
│   ├── <matches-uuid-1>.json
│   └── ...etc
├── PDFs
├── processes
│   ├── <EDP-uuid-1.xml> # Ready-to-fill skeleton file specific for EPD-uuid-1
│   ├── <EDP-uuid-2.xml>
│   └── ...etc
└── templates
    ├── GenPro_template.xml # Template with the EPD schema
    └── GenRef_template.xml # Template with the flow schema

The <epd_process_dir> should have a structure like this:

<epd_process_dir>
├── flows # Contains all reference flows of all processes
└── processes # Contains all the potential source EPDs

The .json files are named after corresponding generic products and should be structured as follows:

{
  "type": "<aggregation_type>",  // "average" or "assembled"
  "uuids": [
    "<uuid-1>",
    "<uuid-2>",
    "<uuid-3>",
    "... more UUIDs ..."
  ]
}

where the provided uuids link to the process files of the EPDs that match.

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Development / running tests

See DEVELOP.md for local setup, versioning, and PyPI release instructions.

For local development, install the package in editable mode with developer dependencies:

python -m pip install -e ".[dev]"

Then run tests:

pytest