2 <xsd:schema xmlns:
xsd=
"http://www.w3.org/2001/XMLSchema">
3 <xsd:element name=
"contact" type=
"ContactType"/>
4 <xsd:complexType name=
"ContactType">
5 <xsd:choice minOccurs=
"1" maxOccurs=
"2">
6 <xsd:element name=
"customer" type=
"xsd:string" />
7 <xsd:element name=
"comment" type=
"xsd:string" minOccurs=
"0"/>