This document describes the parse and build code for handling the Open Financial Connectivity (OFC) file format. The OFC file format is a standard SGML (Standard Generalized Markup Language) format defined by an SGML DTD. To read an OFC file one could use a standard SGML parser that reads in the DTD and the file or write a specific parser that handles only the OFC DTD. We chose to provide one implementation of the OFC specific parser written in ANSI C for portability that could be used by providers on various platforms.