pugixml is a light-weight C++ XML processing library.
It features:
- DOM-like interface with rich traversal/modification capabilities
- Extremely fast non-validating XML parser which constructs the DOM tree
  from an XML file/buffer
- XPath 1.0 implementation for complex data-driven tree queries
- Full Unicode support with Unicode interface variants and automatic
  encoding conversions

1. build dependencies:
   1. gcc-c++
   2. cmake
   3. ctest