pugixml

pugiXML is a C++ library designed for processing XML data and hence, caters to a broad audience of developers and projects where XML processing is required. For starters, the library packs a Document Object Model (DOM)-like interface, allowing you to work with XML data in a structured and hierarchical manner. You can access and manipulate elements and attributes just like you would with a DOM.

It includes an incredibly fast XML parser that can efficiently construct the DOM tree from XML files or buffers. This speed is essential for applications dealing with large XML datasets. This can come in handy if you are planning on including weather capabilities in a web app and therefore, need to a reliable way to receive the data from a web service in XML format, for example.

As far as the support goes, the library is compatible with XPath and Unicode. To put it simply, whether you're dealing with XML documents in multiple languages or need precise querying with XPath, the library ensures that processing tasks are accurate and robust. 

This is can be a go-to solution for developers working with XML data in various applications where speed and reliability are required. Its fast parsing speed, ease of use, and support for Unicode and XPath make it a valuable tool for a wide range of applications and industries.