From the webpage:
BaseX is a very light-weight and high-performance XML database system and XPath/XQuery processor, including full support for the W3C Update and Full Text extensions. An interactive and user-friendly GUI frontend gives you great insight into your XML documents and collections.
To maximize your productivity and workflows, we offer professional support, tailor-made software solutions and individual trainings on XML, XQuery and BaseX. The product itself is completely Open Source (BSD-licensed) and platform independent. Join our mailing lists to get regular updates!
But most important: BaseX runs out of the box and is easy to use…
For those of us who don’t think documents, even XML documents, are all that weird. 😉