     |
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" ...>
<xsd:complexType name="type-name">
<xsd:choice>
<xsd:element name="element1"/>
<xsd:element name="element2"/>
</xsd:choice>
</xsd:complexType>
</schema>
Specifies that only one of the elements should be specified. [(element1 | element2)]
Choice content models can contain elements and any content model.
Use maxOccurs and minOccurs attributes to define the number of times the choice should (is allowed to) be repeated.