Note: You should have at least 2 different browsers to check for compatibility
Note: Google Chrome does not support XML rendering
Checking for well-formed XML is done reasonably by browsers. To check for valid XML, though, a validator is needed
Oxygen has an excellent checker; Eclipse provides a degree of validation; there are other tools as well. The list below is for online validators
Oxygen has an excellent transformer; Firefox with the web development toolbar provides a rudimentary capability (e.g., View Generated Source); there are other tools as well. The list below is for online transformers
Students may select the one they are most used to. An editor which highlights syntax problems, and can validate XML is most desirable)