Skip parsing blank XML

This a sample of the full XML column. The problem with this is that Power Query doesn't parse anything beyond ViolatorUnlicensedIndicator (all of the ContactInfo, Vehicle, CitationOffense1 through CitationOffense4 and Court data are missing after parsing and expanding everything).

<dcjis:DataExchange xmlns:dcjis="http://www.xfact.com/schemas/eopss/dcjis/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcjis-ext="http://www.xfact.com/schemas/eopss/dot-ec/1.0/extension" xmlns:dot-ec="http://www.xfact.com/schemas/eopss/dot-ec/1.0/extension" xmlns:nc="http://niem.gov/niem/niem-core/2.0" xmlns:j="http://niem.gov/niem/domains/jxdm/4.0" xmlns:s="http://niem.gov/niem/structures/2.0"><dcjis:EventTransaction><dcjis:EventHeader><dcjis:UUID>MSPPS_eieio</dcjis:UUID><dcjis:CreateDateTime>2021-10-04T07:41:16</dcjis:CreateDateTime><dcjis:TransactionSource>CJISWeb3MSP</dcjis:TransactionSource><dcjis:MessageIdentifier>1633347753678-3232352e313238-mspps@b7733c2e-1462-4ccb-b0e5-e311699f2894</dcjis:MessageIdentifier><dcjis:TransactionMessageKey>MSPPS</dcjis:TransactionMessageKey><dcjis:UserID>MSP2876</dcjis:UserID><dcjis:OrganizationORIID><dcjis:ID>MAMSP0077</dcjis:ID></dcjis:OrganizationORIID><dcjis:DeviceAddress>170.154.225.92</dcjis:DeviceAddress><dcjis:UserContexts /><dcjis:SchemaVersion>1.0</dcjis:SchemaVersion><dcjis:ApplicationVersion>2.0</dcjis:ApplicationVersion><dcjis:ResponseMechanism>NONE</dcjis:ResponseMechanism><dcjis:CJISUserID><dcjis:ID>MSP2876</dcjis:ID></dcjis:CJISUserID><dcjis:CJISUserPassword>DCJIS</dcjis:CJISUserPassword><dcjis:CJISQueryAuthorizer><dcjis:PersonFullName>KEENEY, ROBERT J</dcjis:PersonFullName></dcjis:CJISQueryAuthorizer><dcjis:CJISQueryOperator><dcjis:PersonFullName>KEENEY, ROBERT J</dcjis:PersonFullName></dcjis:CJISQueryOperator><dcjis:CJISQueryRequester><dcjis:PersonFullName>KEENEY, ROBERT J</dcjis:PersonFullName></dcjis:CJISQueryRequester><dcjis:CJISQueryPurposeCode>C</dcjis:CJISQueryPurposeCode></dcjis:EventHeader><dcjis:EventBody><dcjis-ext:BodyExtension><dcjis-ext:ContentTypeCode>PAYSTATION</dcjis-ext:ContentTypeCode><dcjis-ext:ContentTypeText>MSP Paystation</dcjis-ext:ContentTypeText><dcjis-ext:DataElements><dcjis-ext:DataElement dcjis-ext:elementName="citationNo">142011AB</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="citationDate">2021-09-21</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="resultOfStopCode">C</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="resultOfStopText">Criminal</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="violatorTypeCode">1</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="violatorTypeText">Operator</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="citationVoidedInd">false</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="plateReaderInd">false</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="licenseStateCode">MA</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="licenseStateText">Massachusetts, USA</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="birthYear">1991</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="sexCode">M</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="sexText">Male</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="raceCode">B</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="raceText">BLACK</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="vehiclePlateStateCode">MA</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="vehiclePlateStateText">Massachusetts, USA</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="vehiclePlateTypeCode">PAN</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="vehiclePlateTypeText">PASSENGER NORMAL</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="locationCityCode">226</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="locationCityText">Harvard</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="locationRoadwayTypeCode">2</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="locationRoadwayTypeText">State/Numbered Routes</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="locationRouteNumberCode">2</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="locationRouteNumberText">2</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="searchInd">false</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="issuingAgencyCode">C4</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="issuingAgencyText">State Police Troop C-4</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="issuingOfficerFirstName">RANDY</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="issuingOfficerLastName">MORALES</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="issuingOfficerIdNo">4182</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="offenseSpeedingInd">true</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="activityCode">P</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="activityText">Patrol</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="verbalWarningInd">false</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="organizationInd">false</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="electronicCitationInd">true</dcjis-ext:DataElement><dcjis-ext:DataElement dcjis-ext:elementName="transactionType">ADD</dcjis-ext:DataElement></dcjis-ext:DataElements></dcjis-ext:BodyExtension><dot-ec:ECitation><dot-ec:Citation s:id="citation1"><nc:ActivityIdentification><nc:IdentificationID>142011AB</nc:IdentificationID></nc:ActivityIdentification><nc:ActivityDate><nc:Date>2021-09-21</nc:Date></nc:ActivityDate><j:CitationAgency><nc:OrganizationIdentification><nc:IdentificationID>C4</nc:IdentificationID></nc:OrganizationIdentification><nc:OrganizationName>State Police Troop C-4</nc:OrganizationName></j:CitationAgency><j:CitationIssuingOfficial><nc:RoleOfPersonReference s:ref="person1" /><j:EnforcementOfficialBadgeIdentification><nc:IdentificationID>4182</nc:IdentificationID></j:EnforcementOfficialBadgeIdentification></j:CitationIssuingOfficial><dot-ec:CitationSubject><nc:RoleOfPersonReference s:ref="person2" /><dot-ec:SubjectArrestIndicator>false</dot-ec:SubjectArrestIndicator></dot-ec:CitationSubject><dot-ec:CitationViolation s:id="violation1"><nc:IncidentEvent><nc:ActivityDate><nc:DateTime>2021-09-21T19:55:00</nc:DateTime></nc:ActivityDate></nc:IncidentEvent><dot-ec:IncidentLocation><nc:LocationAddress><dot-ec:StructuredAddress><nc:LocationCityName>Harvard</nc:LocationCityName><dot-ec:LocationStateANSID20Code>MA</dot-ec:LocationStateANSID20Code><nc:LocationStateName>Massachusetts, USA</nc:LocationStateName><dot-ec:LocationCityCode>226</dot-ec:LocationCityCode></dot-ec:StructuredAddress></nc:LocationAddress><nc:LocationHighway><nc:HighwayFullText>RT. 2 EAST MM 108.6</nc:HighwayFullText></nc:LocationHighway></dot-ec:IncidentLocation></dot-ec:CitationViolation><dot-ec:ViolatorCitationTypeCode>1</dot-ec:ViolatorCitationTypeCode><dot-ec:ViolatorCitationTypeText>Operator</dot-ec:ViolatorCitationTypeText><dot-ec:VehicleSearchNonInventoryIndicator>false</dot-ec:VehicleSearchNonInventoryIndicator><dot-ec:CitationTypeCode>C</dot-ec:CitationTypeCode><dot-ec:CitationTypeText>Criminal</dot-ec:CitationTypeText><dot-ec:AcknowledgementTypeCode>VIOL</dot-ec:AcknowledgementTypeCode><dot-ec:AcknowledgementTypeText>Violator</dot-ec:AcknowledgementTypeText><dot-ec:OfficerSignatureIndicator>true</dot-ec:OfficerSignatureIndicator><dot-ec:OfficerSignatureModifiedIndicator>true</dot-ec:OfficerSignatureModifiedIndicator><dot-ec:OfficerSignatureText>4182</dot-ec:OfficerSignatureText><dot-ec:CertificationTypeCode>M</dot-ec:CertificationTypeCode><dot-ec:CertificationTypeText>Mailed to violator</dot-ec:CertificationTypeText><dot-ec:ViolatorOrganizationIndicator>false</dot-ec:ViolatorOrganizationIndicator><dot-ec:TrafficCrashInvolvedIndicator>true</dot-ec:TrafficCrashInvolvedIndicator><dot-ec:IssuingAgencyUniqueCitationID><nc:IdentificationID>1142932</nc:IdentificationID></dot-ec:IssuingAgencyUniqueCitationID><dot-ec:CrashReportID><nc:IdentificationID>2021-0C4-003213</nc:IdentificationID></dot-ec:CrashReportID><dot-ec:CitationPaperOriginationIndicator>false</dot-ec:CitationPaperOriginationIndicator><dot-ec:MACCSCitationID><nc:IdentificationID>CIT21E0265726</nc:IdentificationID></dot-ec:MACCSCitationID></dot-ec:Citation><dot-ec:Person s:id="person1"><nc:PersonName><nc:PersonGivenName>RANDY</nc:PersonGivenName><nc:PersonSurName>MORALES</nc:PersonSurName></nc:PersonName></dot-ec:Person><dot-ec:Person s:id="person2"><nc:PersonBirthDate><nc:Date>1991-07-18</nc:Date></nc:PersonBirthDate><nc:PersonName><nc:PersonGivenName>DAVID</nc:PersonGivenName><nc:PersonMiddleName>R</nc:PersonMiddleName><nc:PersonSurName>WALSH-SIRIANNI</nc:PersonSurName></nc:PersonName><dot-ec:PersonRaceCode>B</dot-ec:PersonRaceCode><nc:PersonRaceText>BLACK</nc:PersonRaceText><dot-ec:PersonSexCode>M</dot-ec:PersonSexCode><nc:PersonSexText>Male</nc:PersonSexText><dot-ec:PersonAugmentation><dot-ec:DriverLicense><dot-ec:DriverLicenseIdentification><nc:IdentificationID>S77996700</nc:IdentificationID><nc:IdentificationExpirationDate><nc:Date>2025-07-18</nc:Date></nc:IdentificationExpirationDate><j:DrivingJurisdictionAuthorityANSID20Code>MA</j:DrivingJurisdictionAuthorityANSID20Code><nc:IdentificationJurisdictionText>Massachusetts, USA</nc:IdentificationJurisdictionText><nc:IdentificationJurisdictionFIPS10-4Code>US</nc:IdentificationJurisdictionFIPS10-4Code><dot-ec:IdentificationJurisdictionFIPS10-4Text>UNITED STATES</dot-ec:IdentificationJurisdictionFIPS10-4Text><dot-ec:IdentificationClassCode>D</dot-ec:IdentificationClassCode><dot-ec:IdentificationClassText>Class D</dot-ec:IdentificationClassText></dot-ec:DriverLicenseIdentification><dot-ec:DriverLicenseCommercialIndicator>false</dot-ec:DriverLicenseCommercialIndicator></dot-ec:DriverLicense></dot-ec:PersonAugmentation><dot-ec:ViolatorUnlicensedIndicator>false</dot-ec:ViolatorUnlicensedIndicator></dot-ec:Person><nc:ContactInformation s:id="contactInformation1"><nc:ContactMailingAddress><dot-ec:StructuredAddress><dot-ec:LocationStreet><dot-ec:Street1FullText>123 SESAME ST</dot-ec:Street1FullText></dot-ec:LocationStreet><nc:LocationCityName>SOMERVILLE</nc:LocationCityName><dot-ec:LocationStateANSID20Code>MA</dot-ec:LocationStateANSID20Code><nc:LocationStateName>Massachusetts, USA</nc:LocationStateName><nc:LocationCountryFIPS10-4Code>US</nc:LocationCountryFIPS10-4Code><nc:LocationCountryName>UNITED STATES</nc:LocationCountryName><nc:LocationPostalCode>02143</nc:LocationPostalCode><nc:LocationPostalExtensionCode>3515</nc:LocationPostalExtensionCode></dot-ec:StructuredAddress></nc:ContactMailingAddress></nc:ContactInformation><nc:PersonContactInformationAssociation><nc:PersonReference s:ref="person2" /><nc:ContactInformationReference s:ref="contactInformation1" /></nc:PersonContactInformationAssociation><dot-ec:Vehicle s:id="vehicle1"><nc:VehicleColorPrimaryCode>WHI</nc:VehicleColorPrimaryCode><nc:ItemMakeName>MERZ</nc:ItemMakeName><nc:ItemModelName>GLC</nc:ItemModelName><nc:ItemModelYearDate>2018</nc:ItemModelYearDate><nc:VehicleCMVIndicator>false</nc:VehicleCMVIndicator><nc:ConveyanceRegistration><nc:ConveyanceRegistrationPlateIdentification><nc:IdentificationID>9GH541</nc:IdentificationID><nc:IdentificationExpirationDate><nc:Date>2022-01-31</nc:Date></nc:IdentificationExpirationDate><j:DrivingJurisdictionAuthorityANSID20Code>MA</j:DrivingJurisdictionAuthorityANSID20Code><nc:IdentificationJurisdictionFIPS10-4Code>US</nc:IdentificationJurisdictionFIPS10-4Code></nc:ConveyanceRegistrationPlateIdentification><dot-ec:VehiclePlateTypeCode>PAN</dot-ec:VehiclePlateTypeCode></nc:ConveyanceRegistration><dot-ec:VehiclePassenger16PlusIndicator>false</dot-ec:VehiclePassenger16PlusIndicator><dot-ec:HazMatPlacardDisplayedIndicator>false</dot-ec:HazMatPlacardDisplayedIndicator><dot-ec:VehicleRegistrationUnknownIndicator>false</dot-ec:VehicleRegistrationUnknownIndicator><nc:InsuranceCarrierName>THE TRAVELERS INDEMNITY COMPANY</nc:InsuranceCarrierName></dot-ec:Vehicle><dot-ec:Offense s:id="CitationOffense1"><dot-ec:OffenseCategoryCode>C</dot-ec:OffenseCategoryCode><dot-ec:OffenseCategoryText>Criminal</dot-ec:OffenseCategoryText><dot-ec:OffenseSpeedingTypeCode>NONE</dot-ec:OffenseSpeedingTypeCode><dot-ec:OffenseViolatedStatute><j:StatuteCodeIdentification><nc:IdentificationID>90</nc:IdentificationID></j:StatuteCodeIdentification><j:StatuteCodeSectionIdentification><nc:IdentificationID>10</nc:IdentificationID></j:StatuteCodeSectionIdentification><dot-ec:StatuteCodeSubSectionIdentification><nc:IdentificationID>A</nc:IdentificationID></dot-ec:StatuteCodeSubSectionIdentification><dot-ec:StatuteCodeFullIdentificationCode>90/10/A</dot-ec:StatuteCodeFullIdentificationCode><dot-ec:StatuteCodeFullIdentificationText>UNLICENSED OPERATION OF MV c90 S10</dot-ec:StatuteCodeFullIdentificationText></dot-ec:OffenseViolatedStatute><dot-ec:OffenseWarningIndicator>false</dot-ec:OffenseWarningIndicator><dot-ec:OffenseViolatorTypeCode>1</dot-ec:OffenseViolatorTypeCode><dot-ec:OffensePayableIndicator>false</dot-ec:OffensePayableIndicator></dot-ec:Offense><dot-ec:Offense s:id="CitationOffense2"><dot-ec:OffenseCategoryCode>C</dot-ec:OffenseCategoryCode><dot-ec:OffenseCategoryText>Criminal</dot-ec:OffenseCategoryText><dot-ec:OffenseSpeedingTypeCode>NONE</dot-ec:OffenseSpeedingTypeCode><dot-ec:OffenseViolatedStatute><j:StatuteCodeIdentification><nc:IdentificationID>90</nc:IdentificationID></j:StatuteCodeIdentification><j:StatuteCodeSectionIdentification><nc:IdentificationID>24</nc:IdentificationID></j:StatuteCodeSectionIdentification><dot-ec:StatuteCodeSubSectionIdentification><nc:IdentificationID>E</nc:IdentificationID></dot-ec:StatuteCodeSubSectionIdentification><dot-ec:StatuteCodeFullIdentificationCode>90/24/E</dot-ec:StatuteCodeFullIdentificationCode><dot-ec:StatuteCodeFullIdentificationText>NEGLIGENT OPERATION OF MOTOR VEHICLE c90 S24(2)(a)</dot-ec:StatuteCodeFullIdentificationText></dot-ec:OffenseViolatedStatute><dot-ec:OffenseWarningIndicator>false</dot-ec:OffenseWarningIndicator><dot-ec:OffenseViolatorTypeCode>1</dot-ec:OffenseViolatorTypeCode><dot-ec:OffensePayableIndicator>false</dot-ec:OffensePayableIndicator></dot-ec:Offense><dot-ec:Offense s:id="CitationOffense3"><dot-ec:OffenseCategoryCode>N</dot-ec:OffenseCategoryCode><dot-ec:OffenseCategoryText>Civil</dot-ec:OffenseCategoryText><dot-ec:OffenseSpeedingTypeCode>NONE</dot-ec:OffenseSpeedingTypeCode><dot-ec:OffenseViolatedStatute><j:StatuteCodeIdentification><nc:IdentificationID>89</nc:IdentificationID></j:StatuteCodeIdentification><j:StatuteCodeSectionIdentification><nc:IdentificationID>4A</nc:IdentificationID></j:StatuteCodeSectionIdentification><dot-ec:StatuteCodeFullIdentificationCode>89/4A</dot-ec:StatuteCodeFullIdentificationCode><dot-ec:StatuteCodeFullIdentificationText>MARKED LANES VIOLATION * c89 S4A</dot-ec:StatuteCodeFullIdentificationText></dot-ec:OffenseViolatedStatute><dot-ec:OffenseWarningIndicator>false</dot-ec:OffenseWarningIndicator><dot-ec:OffenseViolatorTypeCode>1</dot-ec:OffenseViolatorTypeCode><dot-ec:OffensePayableIndicator>true</dot-ec:OffensePayableIndicator></dot-ec:Offense><dot-ec:Offense s:id="CitationOffense4"><dot-ec:OffenseCategoryCode>N</dot-ec:OffenseCategoryCode><dot-ec:OffenseCategoryText>Civil</dot-ec:OffenseCategoryText><dot-ec:OffenseSpeedingTypeCode>90/17</dot-ec:OffenseSpeedingTypeCode><dot-ec:OffenseViolatedStatute><j:StatuteCodeIdentification><nc:IdentificationID>90</nc:IdentificationID></j:StatuteCodeIdentification><j:StatuteCodeSectionIdentification><nc:IdentificationID>17</nc:IdentificationID></j:StatuteCodeSectionIdentification><dot-ec:StatuteCodeSubSectionIdentification><nc:IdentificationID>A</nc:IdentificationID></dot-ec:StatuteCodeSubSectionIdentification><dot-ec:StatuteCodeFullIdentificationCode>90/17/A</dot-ec:StatuteCodeFullIdentificationCode><dot-ec:StatuteCodeFullIdentificationText>SPEEDING RATE OF SPEED EXCEEDING POSTED LIMIT * c90 S17</dot-ec:StatuteCodeFullIdentificationText></dot-ec:OffenseViolatedStatute><dot-ec:DrivingIncidentSpeed><j:DrivingIncidentRecordedSpeedRate><nc:MeasureText>80</nc:MeasureText></j:DrivingIncidentRecordedSpeedRate><j:DrivingIncidentLegalSpeedRate><nc:MeasureText>55</nc:MeasureText></j:DrivingIncidentLegalSpeedRate><dot-ec:SpeedLimitNotificationCode>1</dot-ec:SpeedLimitNotificationCode><dot-ec:SpeedLimitNotificationText>Posted</dot-ec:SpeedLimitNotificationText><dot-ec:DrivingIncidentRecordedSpeedMethodCode>ESTM</dot-ec:DrivingIncidentRecordedSpeedMethodCode><dot-ec:DrivingIncidentRecordedSpeedMethodText>Estimated</dot-ec:DrivingIncidentRecordedSpeedMethodText></dot-ec:DrivingIncidentSpeed><dot-ec:OffenseWarningIndicator>false</dot-ec:OffenseWarningIndicator><dot-ec:OffenseViolatorTypeCode>1</dot-ec:OffenseViolatorTypeCode><dot-ec:OffensePayableIndicator>true</dot-ec:OffensePayableIndicator><dot-ec:OffenseSurchargeAddedTypeCode>H</dot-ec:OffenseSurchargeAddedTypeCode><dot-ec:OffenseSurchargeAddedTypeText>Head Injury Surcharge</dot-ec:OffenseSurchargeAddedTypeText></dot-ec:Offense><j:Court s:id="court1"><nc:OrganizationIdentification><nc:IdentificationID>068</nc:IdentificationID></nc:OrganizationIdentification><nc:OrganizationLocation><nc:LocationAddress><dot-ec:StructuredAddress><dot-ec:LocationStreet><dot-ec:Street1FullText>300 Boylston Street</dot-ec:Street1FullText></dot-ec:LocationStreet><nc:LocationCityName>Clinton</nc:LocationCityName><dot-ec:LocationStateANSID20Code>MA</dot-ec:LocationStateANSID20Code><nc:LocationPostalCode>01510</nc:LocationPostalCode><nc:LocationPostalExtensionCode>0030</nc:LocationPostalExtensionCode></dot-ec:StructuredAddress></nc:LocationAddress></nc:OrganizationLocation><nc:OrganizationName>Clinton District Court</nc:OrganizationName></j:Court></dot-ec:ECitation></dcjis:EventBody></dcjis:EventTransaction></dcjis:DataExchange>

Since Power Query can't seem to handle this, I've also tried breaking up the XML into more manageable chunks (EventHeader, DataElements, etc.). The XML doesn't always include all sections, for example no citation data. I can successfully create the chunks when data exists, but can't come up with anything that can be parsed by Power Query when there's no data for a section.

I can substitute a blank or a NULL in my SQL script, but I don't know how make Power Query skip blanks or NULLs. 

The bottom line is that I need to either be able to make Power Query skip blanks/NULLs, or be able to provide some sort of XML container with no data that can be successfully parsed.

Thanks.

Is there a good tutorial on this anywhere? I know the layout of the table I need, but don't know how/where in Powery Query to define it.