How can I require at least 1 occurrence of an element in the XSD?

Question

How can I require the "Address" element?

If I perform an XSD validation on a document with no "Address" it passes, but I would like it to fail.

Is this possible?

http://en.wikipedia.org/wiki/XSD see the example xsd. it hiding my xsd sample

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"&gt;
  <xs:element name="Address">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Recipient" type="xs:string" />
        <xs:element name="House" type="xs:string" />
        <xs:element name="Street" type="xs:string" />
        <xs:element name="Town" type="xs:string" />
        <xs:element name="County" type="xs:string" minOccurs="0" />
        <xs:element name="PostCode" type="xs:string" />
        <xs:element name="Country">
          <xs:simpleType>
            <xs:restriction base="xs:string">
              <xs:enumeration value="FR" />
              <xs:enumeration value="DE" />
              <xs:enumeration value="ES" />
              <xs:enumeration value="UK" />
              <xs:enumeration value="US" />
            </xs:restriction>
          </xs:simpleType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

Answer 1

You want to set minOccurs="1" in its definition.

Example taken from W3C Schools:

<xs:element name="item" maxOccurs="unbounded">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="title" type="xs:string" minOccurs="0"/>
      <xs:element name="note" type="xs:string" minOccurs="1"/>
      <xs:element name="quantity" type="xs:positiveInteger" minOccurs="0"/>
      <xs:element name="price" type="xs:decimal" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

The note element must appear at least once under item, but the others don't have to appear.