<?xml version="1.0" encoding="utf-8"?>
<!--
Taxonomy based on XBRL standard Version 2.1.
Created by UBmatrix Taxonomy Designer 3.0.2681.0 (2007-02-06 18:45).  
Contact www.ubmatrix.com
Copyright (c) 2002-2007 UBmatrix inc., All Rights Reserved
Produced on 2007-03-02 15:44:08
-->
<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/FiniteNumberOfValues" targetNamespace="http://www.xbrl.us/patterns/2007/FiniteNumberOfValues" elementFormDefault="qualified" attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:roleType roleURI="http://www.xbrl.us/Disclosures" id="Disclosures">
        <link:definition>Disclosures</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.xbrl.us/CurrentNoncurrent" id="CurrentNoncurrent">
        <link:definition>Current/Noncurrent Breakdown</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="FiniteNumberOfValues-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="FiniteNumberOfValues-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="FiniteNumberOfValues-calculation.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Calculation Links, all" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="xbrl-instance-2003-12-31.xsd" />
  <element id="ci_BalanceSheetAbstract" name="BalanceSheetAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="ci_LongTermDebt" name="LongTermDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtCurrent" name="LongTermDebtCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturingInFiveYears" name="LongTermDebtMaturingInFiveYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturingInFourAndFiveYears" name="LongTermDebtMaturingInFourAndFiveYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturingInFourYears" name="LongTermDebtMaturingInFourYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturingInThreeYears" name="LongTermDebtMaturingInThreeYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturingInTwoAndThreeYears" name="LongTermDebtMaturingInTwoAndThreeYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturingInTwoYears" name="LongTermDebtMaturingInTwoYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturingThereafter" name="LongTermDebtMaturingThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
  <element id="ci_LongTermDebtMaturitiesAbstract" name="LongTermDebtMaturitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" abstract="true" nillable="true" />
  <element id="ci_LongTermDebtNoncurrent" name="LongTermDebtNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" />
</schema>
