At one time I implemented services that honoured the robustness principle - "be liberal in what you accept, and conservative in what you send". However, I have

At one time I implemented services that honoured the robustness principle - "be liberal in what you accept, and conservative in what you send". However, I have found that if you are liberal in what you accept, other services can end up dependent on quirks of your liberal acceptance. More recently I have become a believer in the "be conservative in both" strategy. Rigid is good.