<?xml version="1.0"?>

<!--

file      : examples/cxx/tree/polymorphism/supermen.xsd
copyright : not copyrighted - public domain

-->

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:complexType name="person">
    <xsd:sequence>
      <xsd:element name="name" type="xsd:string"/>
    </xsd:sequence>
  </xsd:complexType>

  <!-- substitution group root -->
  <xsd:element name="person" type="person"/>


  <xsd:complexType name="superman">
    <xsd:complexContent>
      <xsd:extension base="person">
        <xsd:attribute name="can-fly" type="xsd:boolean" use="required"/>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:element name="superman" type="superman" substitutionGroup="person"/>

  <xsd:complexType name="batman">
    <xsd:complexContent>
      <xsd:extension base="superman">
        <xsd:attribute name="wing-span" type="xsd:unsignedInt" use="required"/>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:complexType name="supermen">
    <xsd:sequence>
      <xsd:element ref="person" maxOccurs="unbounded"/>
    </xsd:sequence>
  </xsd:complexType>

  <xsd:element name="supermen" type="supermen"/>

</xsd:schema>
