<xsd:element name="clientin" minOccurs="0" maxOccurs="1">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="15" />
<xsd:minLength value="15"/>
<xsd:pattern value="(IIN|BIN){0,1}(\d){12}"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>