Patientxml

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
 
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
	<xs:element name="patients">
	<xs:complexType>
		<xs:sequence>		
			<xs:element ref="patient" minOccurs="1" maxOccurs="unbounded"/>	
			<xs:attribute name="patID" type="patientID" use="required">
			<xs:simpleType name="patientID">
				<xs:restriction base="xs:string">
					<xs:pattern value="MR\d{3}-\d{3}-\d{2}">
				</xs:restriction>
			</xs:simpleType>
			<xs:attribute name="onStudy" type="study" use="required">
			<xs:simpleType name="study">
				<xs:restriction base="xs:string">
					<xs:pattern value="TBC-\d{3}-\d{1}">
				</xs:restriction>
			</xs:simpleType>
		</xs:sequence>
	</xs:complexType>
 
</xs:schema>