
To compile the marking schema into a set of classes:

Move to the 

TOOLS/jaxb-ri-3/bin

folder where JAXB is installed.

run the command

./xjc.sh /Users/nealsnooke/RESEARCH/PROTOTYPES/JAVA/Assignments/MarkingSpreadsheet/src/spreadsheets/XMLSchemas/Marking.xsd -d /Users/nealsnooke/RESEARCH/PROTOTYPES/JAVA/Assignments/MarkingSpreadsheet/src/

This will compile the Marking.xsd to a set of classes in the uk.ac.aber.users.nns.marking package within the MarkingSpreadsheet project

Refresh the MarkingSpreadsheet project (fn-F5)


ALTERNATIVELY 
Eclipse->Run->ExternalTools
Add new configuration to Program and give it a name