<?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 18:51:31
-->
<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" 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" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <element id="ci_RelatedParty" name="RelatedParty" substitutionGroup="xbrli:tuple" nillable="true">
    <complexType>
      <complexContent>
        <restriction base="anyType">
          <sequence>
            <element ref="ci:RelatedPartyName" minOccurs="1" maxOccurs="1" />
            <element ref="ci:RelatedPartyNatureOfRelationship" minOccurs="0" maxOccurs="1" />
            <element ref="ci:RelatedPartyTypeOfRelationship" minOccurs="0" maxOccurs="1" />
            <element ref="ci:RelatedParty-ScheduleOfTransactionsWithRelatedPartyTextBlock" minOccurs="0" maxOccurs="1" />
            <element ref="ci:RelatedPartyTransactionWithRelatedParty" minOccurs="0" maxOccurs="unbounded" />
          </sequence>
          <attribute name="id" type="ID" use="optional" />
        </restriction>
      </complexContent>
    </complexType>
  </element>
  <element id="ci_RelatedPartyName" name="RelatedPartyName" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyNatureOfRelationship" name="RelatedPartyNatureOfRelationship" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedParty-ScheduleOfTransactionsWithRelatedPartyTextBlock" name="RelatedParty-ScheduleOfTransactionsWithRelatedPartyTextBlock" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyTransactionAmount" name="RelatedPartyTransactionAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyTransactionDescription" name="RelatedPartyTransactionDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyTransactionPricingPolicy" name="RelatedPartyTransactionPricingPolicy" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyTransactionType" name="RelatedPartyTransactionType" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_RelatedPartyTransactionWithRelatedParty" name="RelatedPartyTransactionWithRelatedParty" substitutionGroup="xbrli:tuple" nillable="true">
    <complexType>
      <complexContent>
        <restriction base="anyType">
          <sequence>
            <element ref="ci:RelatedPartyTransactionDescription" minOccurs="1" maxOccurs="1" />
            <element ref="ci:RelatedPartyTransactionType" minOccurs="0" maxOccurs="1" />
            <element ref="ci:RelatedPartyTransactionPricingPolicy" minOccurs="0" maxOccurs="1" />
            <element ref="ci:RelatedPartyTransactionAmount" minOccurs="0" maxOccurs="1" />
          </sequence>
          <attribute name="id" type="ID" use="optional" />
        </restriction>
      </complexContent>
    </complexType>
  </element>
  <element id="ci_RelatedPartyTypeOfRelationship" name="RelatedPartyTypeOfRelationship" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ScheduleOfRelatedPartiesAndRelatedPartyTransactionsTextBlock" name="ScheduleOfRelatedPartiesAndRelatedPartyTransactionsTextBlock" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
</schema>
