d in the option elements and 
	they each have unique identifier (selectionIdentifier). The default attribute should point to one of
	these values -->
	<xsd:simpleType name="selectionIdentifier">
		<xsd:restriction base="xsd:NMTOKEN" />
	</xsd:simpleType>

	<xsd:complexType name="selectionType">
		<xsd:sequence minOccurs="1" maxOccurs="unbounded">
			<xsd:element name="option" type="optionType" />
		</xsd:sequence>
		<xsd:attribute use="required" name="label" type="xsd:string" />
		<xsd:attribute use="required" name="name" type="controlIdentifier" />
		<xsd:attribute use="required" name="default" type="selectionIdentifier" />
		<xsd:attribute use="optional" name="description" type="xsd:string" default="" />
	</xsd:complexType>

	<xsd:complexType name="optionType">
		<xsd:simpleContent>
			<xsd:extension base="xsd:string">
				<xsd:attribute use="required" name="name" type="selectionIdentifier" />
				<xsd:attribute use="required" name="label" type="xsd:string" />
				<xsd:attribute use="optional" name="description" type="xsd:string" default="" />
			</xsd:extension>
		</xsd:simpleContent>
	</xsd:complexType>

    <!--Condition represents an input that depends on other inputs. The child elements defines a 
    boolean expression with test as leaf nodes. If the expression evaluates to true, the value 
    in the true attribute is used. If it evaluates to false, the value in the false attribute is used.
    If true or false is omitted, the evaluation of the expression will be ignored. -->
	<xsd:complexType name="conditionType">
		<xsd:choice>
			<xsd:element name="test" type="testType" />
			<xsd:element name="and" type="andType" />
			<xsd:element name="not" type="notType" />
			<xsd:element name="or" type="orType" />
		</xsd:choice>
		<xsd:attribute use="required" name="name" type="xsd:string" />
		<xsd:attribute name="true" type="xsd:string" />
		<xsd:attribute name="false" type="xsd:string" />
	</xsd:complexType>

	<xsd:complexType name="orType">
		<xsd:sequence minOccurs="2" maxOccurs="unbounded">
			<xsd:choice>
				<xsd:element name="test" type="testType" />
				<xsd:element name="and" type="andType" />
				<xsd:element name="not" type="notType" />
				<xsd:element name="or" type="orType" />
			</xsd:choice>
		</xsd:sequence>
	</xsd:complexType>

	<xsd:complexType name="andType">
		<xsd:sequence minOccurs="2" maxOccurs="unbounded">
			<xsd:choice>
				<xsd:element name="test" type="testType" />
				<xsd:element name="and" type="andType" />
				<xsd:element name="not" type="notType" />
				<xsd:element name="or" type="orType" />
			</xsd:choice>
		</xsd:sequence>
	</xsd:complexType>

	<xsd:complexType name="notType">
		<xsd:choice>
			<xsd:element name="test" type="testType" />
			<xsd:element name="and" type="andType" />
			<xsd:element name="or" type="orType" />
			<xsd:element name="not" type="notType" />
		</xsd:choice>
	</xsd:complexType>

	<xsd:simpleType name="operatorType">
		<xsd:restriction base="xsd:NMTOKEN">
			<xsd:enumeration value="equal" />
		</xsd:restriction>
	</xsd:simpleType>

	<xsd:complexType name="testType">
		<xsd:attribute use="required" name="name" type="controlIdentifier" />
		<xsd:attribute use="required" name="operator" type="operatorType" />
		<xsd:attribute use="required" name="value" type="xsd:string" />
		<xsd:attribute use="optional" name="contentType" type="contentType" default="text" />
	</xsd:complexType>
</xsd:schema>
Ê