POSLog XSD

<?xml version="1.0" encoding="UTF-8"?>
<!--
  PearlPOS POSLog - outbound transaction message (POST /POSlog, application/xml)
  Version 1.0

  The structure is based on ARTS POSLog 6.0 with PearlPOS-specific elements
  and code values. This schema describes the message as sent by PearlPOS.

  General rules
  - The message has no XML namespace.
  - Element order is fixed as listed in each sequence.
  - Missing values are either omitted (optional elements) or sent as an empty
    element (<X/>). All simple types therefore accept an empty value.
  - Free text (FreeText, Description, Comment, TenderDescription,
    CustomerInformation, OverUnder/Reason) is URL-encoded (encodeURI). The
    characters &amp; &lt; &gt; " ' are not included.
  - Some attributes and texts can contain the placeholder value "undefined"
    when no value is available. This is documented per field.
  - Optional attributes are normally sent; they are omitted only when the
    value is empty in PearlPOS.
--><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="unqualified" attributeFormDefault="unqualified" version="1.0">

  <!-- ===================== Simple types ===================== -->

  <xs:simpleType name="Empty">
    <xs:restriction base="xs:string">
      <xs:length value="0"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="Text">
    <xs:annotation><xs:documentation>Any text, may be empty.</xs:documentation></xs:annotation>
    <xs:restriction base="xs:string"/>
  </xs:simpleType>

  <xs:simpleType name="EncodedText">
    <xs:annotation><xs:documentation>URL-encoded free text (encodeURI). The characters &amp; &lt; &gt; " ' are not included.</xs:documentation></xs:annotation>
    <xs:restriction base="xs:string"/>
  </xs:simpleType>

  <xs:simpleType name="Amount">
    <xs:annotation><xs:documentation>Number with "." as decimal separator. May be empty.</xs:documentation></xs:annotation>
    <xs:union memberTypes="xs:double Empty"/>
  </xs:simpleType>

  <xs:simpleType name="AmountOrUndefined">
    <xs:annotation><xs:documentation>Number, empty, or the placeholder "undefined" if no value is available.</xs:documentation></xs:annotation>
    <xs:union memberTypes="Amount">
      <xs:simpleType>
        <xs:restriction base="xs:string"><xs:enumeration value="undefined"/></xs:restriction>
      </xs:simpleType>
    </xs:union>
  </xs:simpleType>

  <xs:simpleType name="Integer">
    <xs:union memberTypes="xs:integer Empty"/>
  </xs:simpleType>

  <xs:simpleType name="Boolean">
    <xs:annotation><xs:documentation>true or false. May be empty.</xs:documentation></xs:annotation>
    <xs:union memberTypes="xs:boolean Empty"/>
  </xs:simpleType>

  <xs:simpleType name="BooleanOrUndefined">
    <xs:annotation><xs:documentation>true, false or the placeholder "undefined" if no value is available.</xs:documentation></xs:annotation>
    <xs:restriction base="xs:string">
      <xs:enumeration value="true"/>
      <xs:enumeration value="false"/>
      <xs:enumeration value="undefined"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="DateTime">
    <xs:annotation><xs:documentation>ISO 8601 timestamp in UTC, e.g. 2025-11-05T11:35:51.721Z. May be empty.</xs:documentation></xs:annotation>
    <xs:union memberTypes="xs:dateTime Empty"/>
  </xs:simpleType>

  <xs:simpleType name="Date">
    <xs:annotation><xs:documentation>Date YYYY-MM-DD. May be empty.</xs:documentation></xs:annotation>
    <xs:union memberTypes="xs:date Empty"/>
  </xs:simpleType>

  <xs:simpleType name="TransactionStatusCode">
    <xs:restriction base="xs:string">
      <xs:enumeration value="Finished"/>
      <xs:enumeration value="Canceled"/>
      <xs:enumeration value="Voided"/>
      <xs:enumeration value="Suspended"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="TotalTypeCode">
    <xs:restriction base="xs:string">
      <xs:enumeration value="TransactionGrandAmount"/>
      <xs:enumeration value="TransactionNetAmount"/>
      <xs:enumeration value="TransactionTaxAmount"/>
      <xs:enumeration value="TransactionTenderAmount"/>
      <xs:enumeration value="TransactionCashbackAmount"/>
      <xs:enumeration value="TransactionRoundingAmount"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="AdjustmentActionCode">
    <xs:annotation><xs:documentation>Subtract (-), Add (+), Replace (=). Other PearlPOS adjustment codes are passed through unchanged.</xs:documentation></xs:annotation>
    <xs:restriction base="xs:string"/>
  </xs:simpleType>

  <xs:simpleType name="RoundingDirectionCode">
    <xs:restriction base="xs:string">
      <xs:enumeration value="Up"/>
      <xs:enumeration value="Down"/>
    </xs:restriction>
  </xs:simpleType>

  <!-- ===================== Root ===================== -->

  <xs:element name="POSLog">
    <xs:annotation><xs:documentation>One POSLog per transaction.</xs:documentation></xs:annotation>
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Tra