pidf schema - with extensions in right spot

I'd inadvertantly put one of the extensions under "presence" instead of
under "tuple"

--------------  schema below -------------------

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

<xs:element name="presence" type="presence"/>
	
<xs:complexType name="presence">
   <xs:sequence>
      <xs:element name="tuple" type="tuple" maxOccurs="unbounded"/>
      <xs:element name="note" type="xs:string" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute name="entity" type="xs:anyURI" use="required"/>
</xs:complexType>

<xs:complexType name="tuple">
  <xs:sequence>
    <xs:element name="status" type="status"/>
    <xs:any namespace="##other" processContents="lax" minOccurs="0"
maxOccurs="unbounded"/>
    <xs:element name="contact" type="contact" minOccurs="0"/>
    <xs:element name="note" type="xs:string" minOccurs="0"/>
    <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="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>




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