EeISI Mapper

The EeISI mapper is a Java-based solution that translates from the formats required by EN 16931 (OASIS UBL and UN/CEFACT CII) into the national FatturaPA format and viceversa. It was developed with InfoCert for AgID in order to simplify the integration with the rest of the european invoicing systems by providing a composable toolkit to easily convert between multiple e-invoicing formats.

The project provides a core Java library implementing an intermediate in-memory representation and several converters between this structure and the actual invoicing formats, allowing to quickly and dynamically compose convertion pipelines as needed.

The project also provides a high level API that abstracts away the conversion system and provide a single, easy to use interface to convert XML-based invoices, and a CLI tool as the reference implementation using the aforementioned API.