GNSS-SDR can read assistance data from [Extensible Markup Language (XML)](https://www.w3.org/XML/) files, and can store navigation data decoded from GNSS signals in the same format. This page provides XML Schemas which describe the structure for those XML files.
[XSD (XML Schema Definition)](https://www.w3.org/XML/Schema) is a World Wide Web Consortium (W3C) recommendation that specifies how to formally describe the elements in an XML document.