<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xrds="xri://$xrds" targetNamespace="xri://$xrds" elementFormDefault="qualified">
	<!-- Utility patterns -->
	<xs:attributeGroup name="otherattribute">
		<xs:anyAttribute namespace="##other" processContents="lax"/>
	</xs:attributeGroup>
	<xs:group name="otherelement">
		<xs:choice>
			<xs:any namespace="##other" processContents="lax"/>
			<xs:any namespace="##local" processContents="lax"/>
		</xs:choice>
	</xs:group>
	<!-- Patterns for elements -->
	<xs:element name="XRDS">
		<xs:complexType>
			<xs:sequence>
				<xs:group ref="xrds:otherelement" minOccurs="0" maxOccurs="unbounded"/>
			</xs:sequence>
			<xs:attributeGroup ref="xrds:otherattribute"/>
			<!--XML Schema does not currently offer a means to express that only one of the following two attributes may be used in any XRDS element, i.e., an XRDS document may describe EITHER a redirect identifier or a ref identifier but not both.-->
			<xs:attribute name="redirect" type="xs:anyURI" use="optional"/>
			<xs:attribute name="ref" type="xs:anyURI" use="optional"/>
		</xs:complexType>
	</xs:element>
</xs:schema>
