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        <link:definition>091100 - Disclosure - Mezzanine Equity (Details)</link:definition>
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  <xs:element name="TransactionsWithRelatedPartyAbstract" id="rubi_TransactionsWithRelatedPartyAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
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  <xs:element name="SuperintendentFees" id="rubi_SuperintendentFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="FinancingFeesCapitalized" id="rubi_FinancingFeesCapitalized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="RelatedPartyTransactionTermOfAgreement" id="rubi_RelatedPartyTransactionTermOfAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="CommissionPercentageOnGrossVesselSalesProceedsOrPurchasePriceOfVessels" id="rubi_CommissionPercentageOnGrossVesselSalesProceedsOrPurchasePriceOfVessels" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="PercentageOfNewbuildingVesselsMonitoringFeePaidOnDeliveryOfNewbuildingVessel" id="rubi_PercentageOfNewbuildingVesselsMonitoringFeePaidOnDeliveryOfNewbuildingVessel" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="ClearlakeShippingPteLtdMember" id="rubi_ClearlakeShippingPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LessorOperatingLeasePaymentsToBeReceivedYearFourAndThereafter" id="rubi_LessorOperatingLeasePaymentsToBeReceivedYearFourAndThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="LessorOperatingLeaseNumberOfVesselsOperatedUnderLeaseAgreements" id="rubi_LessorOperatingLeaseNumberOfVesselsOperatedUnderLeaseAgreements" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="VesselsMember" id="rubi_VesselsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
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  <xs:element name="AdvancesForVesselsUnderConstructionAdditions" id="rubi_AdvancesForVesselsUnderConstructionAdditions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
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  <xs:element name="AdjustmentsToAdditionalPaidInCapitalWarrantModification" id="rubi_AdjustmentsToAdditionalPaidInCapitalWarrantModification" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
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  <xs:element name="AntidilutiveSecuritiesAbstract" id="rubi_AntidilutiveSecuritiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="TemporaryEquityTextBlock" id="rubi_TemporaryEquityTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="PreferredStockVotingRightsNumberOfCommonShares" id="rubi_PreferredStockVotingRightsNumberOfCommonShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="ThresholdConsecutiveTradingDays" id="rubi_ThresholdConsecutiveTradingDays" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="PreferredStockConvertibleRedemptionPremiumAfterFirstAnniversaryOfIssuance" id="rubi_PreferredStockConvertibleRedemptionPremiumAfterFirstAnniversaryOfIssuance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="PreferredStockConvertibleConversionRatePercentage" id="rubi_PreferredStockConvertibleConversionRatePercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="PreferredStockConvertibleRedemptionPremiumBeforeFirstAnniversaryOfIssuance" id="rubi_PreferredStockConvertibleRedemptionPremiumBeforeFirstAnniversaryOfIssuance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
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  <xs:element name="SharePurchaseAgreementRelatedToNewbuildingMRSPAMember" id="rubi_SharePurchaseAgreementRelatedToNewbuildingMRSPAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
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  <xs:element name="CumulativeStockIssuedSharesNewIssues" id="rubi_CumulativeStockIssuedSharesNewIssues" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="PreFundedWarrantsMember" id="rubi_PreFundedWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="May2026OfferingMember" id="rubi_May2026OfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="PlacementAgentWarrantsMember" id="rubi_PlacementAgentWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ClassCWarrantsMember" id="rubi_ClassCWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="PercentageOfSharesSold" id="rubi_PercentageOfSharesSold" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="PublicOfferingUnits" id="rubi_PublicOfferingUnits" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="NumberOfSecuritiesIncludedInUnitsOffered" id="rubi_NumberOfSecuritiesIncludedInUnitsOffered" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
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  <xs:element name="IssuanceOfCommonStockAndWarrantsAbstract" id="rubi_IssuanceOfCommonStockAndWarrantsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ClassBWarrantsMember" id="rubi_ClassBWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
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  <xs:element name="PercentageOfInvestorsHoldingWarrantsIncludedInInducement" id="rubi_PercentageOfInvestorsHoldingWarrantsIncludedInInducement" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
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</xs:schema>
