gistfile1.xml

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<xs:element name="name">
		<xs:complexType>
			<xs:simpleContent>
				<xs:extension base="xs:string">
					<xs:attribute name="title" use="required">
						<xs:simpleType>
							<xs:restriction base="xs:string">
								<xs:enumeration value="Professor" />
								<xs:enumeration value="Lecturer" />
								<xs:enumeration value="Reader" />
								<xs:enumeration value="Dr" />
							</xs:restriction>
						</xs:simpleType>
					</xs:attribute>
					<xs:attribute name="first" type="xs:string" use="required" />
					<xs:attribute name="last" type="xs:string" use="required" />
				</xs:extension>
			</xs:simpleContent>
		</xs:complexType>
	</xs:element>
	<xs:element name="teaching">
		<xs:complexType>
			<xs:sequence>
				<xs:element ref="course" minOccurs="1" maxOccurs="unbounded" />
			</xs:sequence>
		</xs:complexType>
	</xs:element>	
	<xs:element name="course">
		<xs:complexType>
			<xs:simpleContent>
				<xs:extension base="xs:string">
					<xs:attribute name="code" use="required">
						<xs:simpleType>
							<xs:restriction base="xs:token">
								<!-- '^(?<CoursePrefix>[A-Z]{2})(?<CourseDigits>\d{4})(?<Semester>[A]|[B]?)\z' -->
								<xs:pattern value="[A-Z]{2}\d{4}([A]|[B]?)" />
							</xs:restriction>
						</xs:simpleType>
					</xs:attribute>
				</xs:extension>
			</xs:simpleContent>
		</xs:complexType>
	</xs:element>
	<xs:element name="research" type="xs:string" />
	<xs:element name="lecturer">
		<xs:complexType>
			<xs:sequence>
				<xs:element ref="name" minOccurs="1" maxOccurs="1" />
				<xs:element ref="teaching" minOccurs="1" maxOccurs="1" />
				<xs:element ref="research" minOccurs="0" maxOccurs="1" />
			</xs:sequence>
		</xs:complexType>
	</xs:element>
	<xs:element name="lecturers">
		<xs:complexType>
			<xs:sequence>
				<xs:element ref="lecturer" minOccurs="1" maxOccurs="unbounded" />
			</xs:sequence>
		</xs:complexType>
	</xs:element>
</xs:schema>