<?xml version="1.0" encoding="utf-8"?>
<!--
Taxonomy based on XBRL standard Version 2.1.
Created by UBmatrix Taxonomy Designer 3.0.2756.2310 (2007-05-12 03:16).  
Contact www.ubmatrix.com
Copyright (c) 2002-2007 UBmatrix inc., All Rights Reserved
Produced on 2007-06-14 06:33:06
-->
<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ci="http://www.xbrl.us/patterns/2007/MasterDetail" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" targetNamespace="http://www.xbrl.us/patterns/2007/MasterDetail" elementFormDefault="qualified" attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:href="MasterDetail-label.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Label Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:href="MasterDetail-presentation.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Presentation Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:href="MasterDetail-definition.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links, all" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <element id="ci_AllRelatedParties" name="AllRelatedParties" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_AllRelatedPartyTransactions" name="AllRelatedPartyTransactions" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_AllRelatedPartyTypes" name="AllRelatedPartyTypes" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_AssociateCode" name="AssociateCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_DirectorCode" name="DirectorCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_DirectorExecutiveAndEmployeeBenefitsCode" name="DirectorExecutiveAndEmployeeBenefitsCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_ExplanationOfWhetherRelatedPartyTransactionIsSecured" name="ExplanationOfWhetherRelatedPartyTransactionIsSecured" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_JaneDoe" name="JaneDoe" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_JohnDoe" name="JohnDoe" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_JointControlOrSignificantInfluenceCode" name="JointControlOrSignificantInfluenceCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_JointVentureCode" name="JointVentureCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_KeyManagementPersonnelCode" name="KeyManagementPersonnelCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_LeasingArrangementsCode" name="LeasingArrangementsCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_LicenseAgreementsCode" name="LicenseAgreementsCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_ParentCode" name="ParentCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_PurchasesOrSalesOfGoodsCode" name="PurchasesOrSalesOfGoodsCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_PurchasesOrSalesOfPropertyOrOtherAssetsCode" name="PurchasesOrSalesOfPropertyOrOtherAssetsCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_RelatedPartiesDimension" name="RelatedPartiesDimension" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="ci_RelatedPartiesHypercube" name="RelatedPartiesHypercube" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="ci_RelatedPartyTransactionAmount" name="RelatedPartyTransactionAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyTransactionOutstandingBalance" name="RelatedPartyTransactionOutstandingBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_RelatedPartyTransactionPricingPolicy" name="RelatedPartyTransactionPricingPolicy" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyTransactionsCodeListDimension" name="RelatedPartyTransactionsCodeListDimension" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="ci_RelatedPartyTransactionsHypercubeCopy" name="RelatedPartyTransactionsHypercubeCopy" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="ci_RelatedPartyTypesCodeListDimension" name="RelatedPartyTypesCodeListDimension" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="ci_ScheduleOfRelatedPartiesAndRelatedPartyTransactionsTextBlock" name="ScheduleOfRelatedPartiesAndRelatedPartyTransactionsTextBlock" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_SubsidiaryCode" name="SubsidiaryCode" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
</schema>
