factur-x is a Python library for generating, validating, and extracting Factur-X/ZUGFeRD hybrid PDF+XML invoices. It exposes a high-level API (generate_from_file, generate_from_binary, get_xml_from_pdf, xml_check_xsd, xml_check_schematron, generate_cii_xml, generate_ubl_xml) and three CLI entry points (facturx-pdfgen, facturx-pdfextractxml, facturx-xmlcheck). The library supports both CII (Cross-Industry Invoice) and UBL 2.1 XML profiles, and bundles the necessary XSD schemas, Schematron/XSLT validation rules, and code-list databases. It is a standards-compliance tool for e-invoicing, not a data pipeline or research project.

nfelib is a Python library providing data bindings, serialization, and SOAP client support for Brazilian electronic fiscal documents (NF-e, CT-e, MDF-e, NFSe, BP-e). It uses xsdata to auto-generate Python dataclasses from official XSD schemas (versions v4.0, v3.0, v1.0). The library includes a CommonMixin base class for common XML operations (to_xml, from_xml, sign_xml, to_pdf, validate_xml), SOAP service bindings generated from WSDLs, and server endpoint configurations per Brazilian state (UF). It also provides code generation tools (generate_bindings.py) and server endpoint scraping utilities (servers_scraper.py). The architecture mixes auto-generated binding code with handcrafted integration patterns and testing utilities. The project has strong test coverage, including round-trip XML serialization tests, protocol buffer validation, and fingerprint-based detection of external schema changes. It is designed for ERP integration (e.g., Odoo) and fiscal compliance software.