Common Data Format (CDF) Prototypes This repository contains assorted prototypes, examples and guidance for the use of NIST 1500 series Common Data Formats. How models (UML) are mapped to schemas How to subset 1500 series CDF schemas Cast Vote Record (CVR) Examples Interactive Sample Ballot to CVR Prototype Relational Schemas from CDFs Schematron rulesets Click here for a complete list of CDF resources.