Using XSD to validate one element, or other element, or both

Question

I'm using an XSD file and C# .NET to validation XML. I need to validate the <Message> element has either:

<Edit> OR <Delete> OR <Edit> <Delete> (IE both elements)

Can this be done in XSD?

Answer 1

Yes, this XSD,

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Message">
    <xs:complexType>
      <xs:choice>
        <xs:sequence>
          <xs:element name="Edit"/>
          <xs:element name="Delete" minOccurs="0"/>
        </xs:sequence>
        <xs:element name="Delete"/>
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>

will allow <Edit/> or <Delete/> or <Edit/><Delete/>, as requested.