Surprisingly (?) there is not a lot of choice for X, and regrettably I will have to go with XML... Why 'regrettably'? Well, I don't really like XML. I find it a pain ...

Extensible Forms Description Language (XFDL) files are used by large organizations such as the United States military to store and exchange form data within an Extensible Markup Language (XML) format.

The extensible markup language (XML) format facilitates compliance with FDA's new requirements for prescription drug labeling submissions, improves patient safety, and enhances manufacturing sponsor ...

What are JSON, XML, and YAML? Text-file formats that can be used to store structured data that can be handy for embedded and Web applications. Most developers will be familiar with XML (Extensible ...

XML, or the Extensible Markup Language, is a standard managed by the World Wide Web Consortium. The flexible text format was initially designed for data exchange on the Internet. Yet it's become much ...