HPXML is a flexible way to transfer home energy audit and retrofit data via a standardized schema. This flexibility, one if its greatest strengths, is also a weakness. Home Energy Score (HEScore) requires very specific data points to be reported as inputs to the API. Many of those data points can be represented in the HPXML syntax in multiple ways due to the flexibility of the standard. The purpose of this guide is to document the assumptions that are made in the translation of HPXML data elements into HEScore software inputs.