<xs:element name="HistoryInfos" minOccurs="0">
    <xs:annotation>
        <xs:documentation xml:lang="en">A collection of history info items.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:sequence>
            <xs:element name="HistoryInfo" maxOccurs="999">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Used to provide history of the booking.</xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:complexContent>
                        <xs:extension base="SourceType">
                            <xs:sequence>
                                <xs:element name="Items" maxOccurs="99">
                                    <xs:annotation>
                                        <xs:documentation xml:lang="en">Collection of changed items.</xs:documentation>
                                    </xs:annotation>
                                    <xs:complexType>
                                        <xs:sequence>
                                            <xs:element name="Item" maxOccurs="999">
                                                <xs:annotation>
                                                    <xs:documentation xml:lang="en">History item details.</xs:documentation>
                                                </xs:annotation>
                                                <xs:complexType>
                                                    <xs:complexContent>
                                                        <xs:extension base="ParagraphType">
                                                            <xs:attribute name="GuestID" type="StringLength1to32" use="optional">
                                                                <xs:annotation>
                                                                    <xs:documentation xml:lang="en">Unique identifier of the guest to whom this transaction applies.</xs:documentation>
                                                                </xs:annotation>
                                                            </xs:attribute>
                                                            <xs:attribute name="ItemName" type="StringLength1to64" use="optional">
                                                                <xs:annotation>
                                                                    <xs:documentation xml:lang="en">The item being modified in this transaction.</xs:documentation>
                                                                </xs:annotation>
                                                            </xs:attribute>
                                                            <xs:attribute name="OldValue" type="StringLength1to255" use="optional">
                                                                <xs:annotation>
                                                                    <xs:documentation xml:lang="en">Specifies the old value of an item.</xs:documentation>
                                                                </xs:annotation>
                                                            </xs:attribute>
                                                            <xs:attribute name="NewValue" type="StringLength1to255" use="optional">
                                                                <xs:annotation>
                                                                    <xs:documentation xml:lang="en">Specifies the new value of an item.</xs:documentation>
                                                                </xs:annotation>
                                                            </xs:attribute>
                                                            <xs:attribute name="Classification" type="StringLength1to128" use="optional">
                                                                <xs:annotation>
                                                                    <xs:documentation xml:lang="en">Specifies the classification of the item (e.g., RES_GUEST, RES_HEADER).</xs:documentation>
                                                                </xs:annotation>
                                                            </xs:attribute>
                                                        </xs:extension>
                                                    </xs:complexContent>
                                                </xs:complexType>
                                            </xs:element>
                                        </xs:sequence>
                                        <xs:attributeGroup ref="OptionalCodeOptionalNameGroup">
                                            <xs:annotation>
                                                <xs:documentation xml:lang="en">Specifies a general category of history items or type of history item (e.g., RESERVATION, TRANSACTION).</xs:documentation>
                                            </xs:annotation>
                                        </xs:attributeGroup>
                                    </xs:complexType>
                                </xs:element>
                            </xs:sequence>
                            <xs:attribute name="LastModified" type="xs:dateTime" use="required" />
                        </xs:extension>
                    </xs:complexContent>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
    </xs:complexType>
</xs:element>