Unified Standard Format Markers are a system of short alphanumeric markers (which follow backslashes in text files) used by UBS and SIL to encode Bible translations. Each book is usually stored in a separate file. (In floppy disk days, it was each chapter.) USFM is mostly used by the Paratext editor for Bible translations in progress.
The XML data file and scripts uploaded today are the simple beginnings of a framework to allow access to folders containing USFM texts. USFMMarkers.py loads and converts the XML file containing USFM codes, and provides some simple look-up functions. USFMFilenames.py accepts a folder name and searches for USFM files in that folder. All very simple, but hopefully another small step forwards.