Open-source components are a central part of the e-invoicing ecosystem. They create transparency around data models, validation rules, and exchange mechanisms, and support the implementation of established standards such as EN 16931, XRechnung, and ZUGFeRD/Factur-X. Open reference implementations, validators, and transformation tools foster interoperability, accelerate the adoption of standard-compliant solutions, and reduce dependencies on proprietary systems. At the same time, they enable the collaborative advancement of technical foundations.

Using open components, however, calls for careful assessment. Companies must weigh quality, maintenance, and release cycles just as much as licensing models and governance structures. They must also ensure the traceability of verification and transformation logic, as well as reliable integration into production process landscapes. Without clear oversight, there is a risk of fragmented solutions and inconsistent implementations.

The “Open Source” Competence Center addresses these questions through the systematic classification of available components, the assessment of their fitness for use, and the development of guidelines for governance, quality assurance, and the sustainable use of open technologies in the e-invoicing environment.

Key Priorities

Assessment of open components and reference implementations

Classification of governance and maintenance models

Analysis of security- and quality-relevant maturity levels

Development of guidelines for licensing models, compliance, and use

Monitoring of community-based innovation dynamics