Whenever a string is taken out of libxml2 and returned (for example in AttributeNode::get_value), it is copied into a ustring (aka string). It might be nice to have the option to avoid that memory allocation and copying by returning a view (std::string_view or even std::u8string_view) instead. Of course this would require the owner to handle lifetimes appropriately, but that’s expected when views are in use.