classification(name: 'OxfordSoftwareEngineering', id: 'http://www.softeng.ox.ac.uk') {
    model(name: 'Subject') {
        dataElement(name: 'Name') {
            description 'Name for subject matter for set of courses'
            valueDomain(name: 'Name') {
                dataType(name: 'String')
            }
            ext 'Usage', 'Mandatory'
            ext 'Min Occurs', '1'
            ext 'Max Occurs', '1'
        }
        dataElement(name: 'Description') {
            description 'Description of subject matter'
            valueDomain(name: 'Description') {
            }
            ext 'Usage', 'Mandatory'
            ext 'Min Occurs', '1'
            ext 'Max Occurs', '1'
            ext 'Data Item Number', '2'
        }
        dataElement(name: 'Level') {
            description 'Course level'
            valueDomain(name: 'Level') {

            }
            ext 'Usage', 'Mandatory'
            ext 'Min Occurs', '1'
            ext 'Max Occurs', '1'
            ext 'Data Item Number', '3'
        }
        dataElement(name: 'subjectCode') {
            description 'unique id for subject'
            valueDomain(name: 'subjectCode') {
                dataType(name: 'Integer')
            }
            ext 'Usage', 'Mandatory'
            ext 'Min Occurs', '1'
            ext 'Max Occurs', '1'
            ext 'Data Item Number', '4'
        }