Editing Schemas Update

I haven't fixed the XML Schema, but it seems too trivial a detail to devote much more time to at the moment. I have added functionality to the EditSchemaDialog to allow the user to edit the activeStates table for each State. I've also re-written the NewSchemaDialog to match, and cleaned up the Schema creation code.

Other than adding support for XML, I don't intend to add any more new features to the GUI. There are only a couple of weeks until the Software Submission deadline, and I feel that they would be best used testing and fixing bugs.

XML Schema Issue

I would still like the option to export the Schema Library to an XML file so I've been working on writing an XML Schema file to validate against.

I'm familiar with XML, but I've never worked with XML Schema before. I understand it for the most part, but I've run into an error when it comes to validating. The validator output is not very helpful! All I can tell for now is that:

Element 'element' is invalid, misplaced, or occurs too often.

I'm not sure that the XML Schema is required to parse an XML document successfully, but I'd prefer to have it just in case. Of course, this is a relatively minor feature so I don't want to spend a huge amount of time on it at the moment.