PIDF - xml schema with multiple notes and target namespace

I changed note so it can appear multiple times as you discussed in mail.  I
also fixed the target namespace so it validates examples 4.3.2 and 4.3.3
(after changing "value" to "basic" and removing the extension under presence
in those examples).

------------- schema follows --------------


<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="urn:iana:impp:presence:"
xmlns:tns="urn:iana:impp:presence:"
xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified"
attributeFormDefault="unqualified">
	
<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="xs:string" 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="xs:string" 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"/>
    <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>

<!-- Global Attributes -->
<xs:attribute name="mustUnderstand" type="xs:boolean" default="0"/>

</xs:schema>


  [reminder: [email protected] for non-technical discussions, please]