Handling of error messages

To be written...

Discuss mechanisms to handle error messages ...

The current implementation seriously leaks implementation details: e.g. if a tag <a> doesn't accept a certain attribute attr, the error will show as "startAttribute_attr is not a member of sTag_a" ... which is not very informative to the programmer who is not familiar with the workings of Unmarshallers.

Validation (e.g. using RELAX) could alleviate this... are there other ways? ...?