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

  <!-- Types used by both the Request Types and the Response Types:
       The following types are used by both the Request Types and the Response Types.
  -->

  <xsd:complexType name="RecipientsType">
    <xsd:sequence>
      <xsd:element name="recipient" type="RecipientType" maxOccurs="unbounded"/>
    </xsd:sequence>
  </xsd:complexType>
  
  <xsd:complexType name="RecipientType">
    <xsd:simpleContent>
      <xsd:extension base="xsd:string">
        <xsd:attribute name="uid" type="xsd:unsignedInt" use="optional" default="0"/>
      </xsd:extension>
    </xsd:simpleContent>
  </xsd:complexType>

  <xsd:simpleType name="MessageFormatType">
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value="SMS"/>
      <xsd:enumeration value="voice"/>
    </xsd:restriction>
  </xsd:simpleType>

</xsd:schema>