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  <xs:element id="open_PublicOfferingAndOverAllotmentOptionMember" abstract="true" name="PublicOfferingAndOverAllotmentOptionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_OptionIndexedToIssuersEquityCost" abstract="false" name="OptionIndexedToIssuersEquityCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_FinishedGoodsAbstract" abstract="true" name="FinishedGoodsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="open_MultipleSeniorRevolvingCreditFacilitiesMember" abstract="true" name="MultipleSeniorRevolvingCreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_CommonStockReceivedUponWarrantExercise" abstract="false" name="CommonStockReceivedUponWarrantExercise" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="open_IncreaseDecreaseInEscrowReceivable" abstract="false" name="IncreaseDecreaseInEscrowReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_RepoFacility2019R1Member" abstract="true" name="RepoFacility2019R1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_ClassOfWarrantOrRightExercised" abstract="false" name="ClassOfWarrantOrRightExercised" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="open_SoftwareImplementationCostsMember" abstract="true" name="SoftwareImplementationCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_LineOfCreditFacilityFullyCommittedBorrowingCapacity" abstract="false" name="LineOfCreditFacilityFullyCommittedBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_UnvestedStockOptionsAndRestrictedSharesMember" abstract="true" name="UnvestedStockOptionsAndRestrictedSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_SignificantRisksAndUncertaintiesPolicyTextBlock" abstract="false" name="SignificantRisksAndUncertaintiesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="open_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsWithServiceConditionAwardVestingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsWithServiceConditionAwardVestingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="open_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedUnrecognizedCompensationExpense" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedUnrecognizedCompensationExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_RevolvingFacility20183Member" abstract="true" name="RevolvingFacility20183Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeePayrollContributionsWithHeld" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeePayrollContributionsWithHeld" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_RevolvingFacility20211Member" abstract="true" name="RevolvingFacility20211Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_BusinessCombinationConsiderationTransferredDeferredPaymentAmount" abstract="false" name="BusinessCombinationConsiderationTransferredDeferredPaymentAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_ShareBasedCompensationArrangementByShareBasedPaymentAwardRecognizedOverRemainingTermOfOfferingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRecognizedOverRemainingTermOfOfferingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="open_TermDebtFacility2021S3Member" abstract="true" name="TermDebtFacility2021S3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_SecuritySystemsMember" abstract="true" name="SecuritySystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_MarketableSecuritiesCashAndCashEquivalents" abstract="false" name="MarketableSecuritiesCashAndCashEquivalents" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_IncentiveStockOptionsMember" abstract="true" name="IncentiveStockOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_UnvestedSharesFromEarlyExerciseMember" abstract="true" name="UnvestedSharesFromEarlyExerciseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_SeniorConvertibleNotes2026Member" abstract="true" name="SeniorConvertibleNotes2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="open_LineOfCreditFacilityFullyCommittedMaximumBorrowingCapacity" abstract="false" name="LineOfCreditFacilityFullyCommittedMaximumBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="open_FairValueDisclosuresTableTextBlock" abstract="false" name="FairValueDisclosuresTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="open_TermDebtFacility2020M1Member" abstract="true" name="TermDebtFacility2020M1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
