XML/XML Schema/minOccurs

minOccurs and maxOccurs

<?xml version="1.0"?>
<name xmlns="http://www.wbex.ru/name"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.wbex.ru/name Schema.xsd"
  title="Mr.">
  <first>first</first>
  <middle>middle</middle>
  <last>last</last>
</name>

File: Schema.xsd
<?xml version="1.0"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:target="http://www.wbex.ru/name"
  targetNamespace="http://www.wbex.ru/name"
  elementFormDefault="qualified">
  <group name="NameGroup">
    <sequence>
      <element name="first" type="string" minOccurs="1"
        maxOccurs="unbounded" />
      <element name="middle" type="string" minOccurs="0"
        maxOccurs="1" />
      <element name="last" type="string" />
    </sequence>
  </group>
  <complexType name="NameType">
    <group ref="target:NameGroup" />
    <attribute name="title" type="string" />
  </complexType>
  <element name="name" type="target:NameType" />
</schema>