This is a pre-release of the ATOP system. While ATOP is intended to be a utility for reading in a TEI ODD file and writing out corresponding RELAX NG and Schematron schemas, this pre-release only reads in ODD files that follow specific limitations. These limited ODD files (colloquially called PLODD files for “pruned & localized ODD” file) should conform to both the Schemas/ploddSchemaSpecification.rng closed schema and the Schemas/pre-transpile.sch open schema.