CustomerGroup

Element Group Information

Model

Customer | Customers
Children: Customer, Customers

Used By

Complex Types DocumentBoardingPassType, DocumentCancellationRulesType, DocumentCertificateType, DocumentConfirmationType, DocumentContractType, DocumentDriverLicenceType, DocumentFollowUpType, DocumentIdentityCardType, DocumentInsuranceType, DocumentInvoiceStatementType, DocumentInvoiceType, DocumentNoticeType, DocumentPassportType, DocumentPaymentStatementType, DocumentQuotationType, DocumentReceiptType, DocumentResidentPermitType, DocumentSellingConditionsRulesType, DocumentTicketType, DocumentTravelDocumentType, DocumentType, DocumentVisaType, DocumentVoucherType, TicketType
Elements IdentityCard, Passport, Visa

Source 

<xs:group name="CustomerGroup">
  <xs:choice>
    <xs:annotation>
      <xs:documentation>One or Many</xs:documentation>
    </xs:annotation>
    <xs:element ref="Customer"/>
    <xs:element ref="Customers"/>
  </xs:choice>
</xs:group>