PIDF - schema, added xml:lang attribute in note

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="urn:ietf:params:xml:ns:cpim-pidf:"
xmlns:tns="urn:ietf:params:xml:ns:cpim-pidf:"
xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified"
attributeFormDefault="unqualified">

    <!-- This import brings in the XML language attribute xml:lang-->
    <xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/xml.xsd"/>

    <xs:element name="presence" type="tns:presence"/>
    
    <xs:complexType name="presence">
        <xs:sequence>
            <xs:element name="tuple" type="tns:tuple"
maxOccurs="unbounded"/>
            <xs:element name="note" type="tns:note" minOccurs="0"
maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute name="entity" type="xs:anyURI" use="required"/>
    </xs:complexType>
    
    <xs:complexType name="tuple">
        <xs:sequence>
            <xs:element name="status" type="tns:status"/>
            <xs:any namespace="##other" processContents="lax" minOccurs="0"
maxOccurs="unbounded"/>
            <xs:element name="contact" type="tns:contact" minOccurs="0"/>
            <xs:element name="note" type="tns:note" minOccurs="0"
maxOccurs="unbounded"/>
            <xs:element name="timestamp" type="xs:dateTime" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="id" type="xs:ID" use="required"/>
    </xs:complexType>
    
    <xs:complexType name="status">
        <xs:sequence>
            <xs:element name="basic" type="tns:basic" minOccurs="0"/>
            <xs:any namespace="##other" processContents="lax" minOccurs="0"
maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
    
    <xs:simpleType name="basic">
        <xs:restriction base="xs:string">
            <xs:enumeration value="open"/>
            <xs:enumeration value="closed"/>
        </xs:restriction>
    </xs:simpleType>
    
    <xs:complexType name="contact">
        <xs:simpleContent>
            <xs:extension base="xs:anyURI">
                <xs:attribute name="priority" type="xs:unsignedByte"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    
    <xs:complexType name="note">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute ref="xml:lang"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    
    <!-- Global Attributes -->
    <xs:attribute name="mustUnderstand" type="xs:boolean" default="0"/>
</xs:schema>


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