IntelliSense not working for xml in list item

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
    <xs:element name="RManager">
        <xs:complexType>
            <xs:sequence>
                <xs:choice maxOccurs="unbounded">
                    <xs:element name="Method">
                        <xs:complexType>
                            <xs:attribute name="Type" type="xs:string" use="required"/>
                            <xs:attribute name="Name" type="xs:string" use="required"/>
                        </xs:complexType>
                    </xs:element>
                    <xs:element name="RightsRule">
                        <xs:complexType>
                            <xs:attribute name="Name" type="xs:string" use="required"/>
                            <xs:attribute name="Rights" use="required">
                                <xs:simpleType>
                                    <xs:list>
                                        <xs:simpleType>
                                            <xs:restriction base="xs:string">
                                                <xs:enumeration value="Create"/>
                                                <xs:enumeration value="Delete"/>
                                                <xs:enumeration value="Edit"/>
                                            </xs:restriction>
                                        </xs:simpleType>
                                    </xs:list>
                                </xs:simpleType>
                            </xs:attribute>
                        </xs:complexType>
                    </xs:element>
                </xs:choice>
            </xs:sequence>
            <xs:attribute name="Inheritance" type="xs:boolean" use="required"/>
            <xs:attribute name="UpdatePeriod" type="xs:unsignedLong" use="optional"/>
        </xs:complexType>
    </xs:element>
</xs:schema>