<?xml version="1.0" encoding="UTF-8"?>
<xs:schema id="Document" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop">
  <xs:element name="Document">
    <xs:complexType>
      <xs:choice maxOccurs="unbounded">
        <xs:element name="Parameters">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="number_of_bill" type="xs:string" minOccurs="0" />
              <xs:element name="customer_number" type="xs:long" minOccurs="0" />
              <xs:element name="contract_number" type="xs:string" minOccurs="0" />
			  <xs:element name="purchase_number" type="xs:string" minOccurs="0"/>
			</xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element name="Accounting_period">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="maturity_date" type="xs:dateTime" minOccurs="0" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element name="Payment_information">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="bank_account_number" type="xs:string" minOccurs="0" />
              <xs:element name="bank_code" type="xs:string" minOccurs="0" />
              <xs:element name="variable_symbol" type="xs:string" minOccurs="0" />
              <xs:element name="specific_symbol" type="xs:string" minOccurs="0" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element maxOccurs="unbounded" name="detail_invoice_item">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="customer_hierarchy" type="xs:string" />
              <xs:element name="customer_name" type="xs:string" />
              <xs:element name="customer_group_name" type="xs:string" />
              <xs:element name="phone_number" type="xs:string" />
              <xs:element name="service_group_name" type="xs:string" />
              <xs:element name="billing_service_name" type="xs:string" />
              <xs:element name="event_name" type="xs:string" />
              <xs:element name="unit_quantity" type="xs:string" />
              <xs:element name="unit_price" type="xs:decimal" />
              <xs:element name="metric_unit_code" type="xs:string" />
              <xs:element name="item_ammount" type="xs:decimal" />
              <xs:element minOccurs="0" name="discount" type="xs:decimal" />
			  <xs:element name="allowance" type="xs:decimal" minOccurs="0"/>
			  <xs:element name="taxable" type="xs:decimal" minOccurs="0"/>
			  <xs:element name="taxable_non" type="xs:decimal" minOccurs="0"/>
			</xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>