Just like bad/fragmented YAML libraries now, there were plenty of bad XML libraries and implementations. I didn't think XML was too bad until I had to write a S

Just like bad/fragmented YAML libraries now, there were plenty of bad XML libraries and implementations. I didn't think XML was too bad until I had to write a SOAP request where the endpoint would throw an error if the arguments (in their own tags, mind you) weren't in a specific order. The endpoint gave me no hints. Additionally we had to update WSDLs for these services, but the service generating the WSDL used features our server's SOAP library didn't support, so someone had to manually transform the XML and via lengthy trial and error to get it to work.