XML: How to place a restriction to a base simple element which was extended with attributes?

I have the following xml:

<?xml version="1.0" encoding="utf-8"?>
<Root>
  <Child name="MyType" compareMode="EQ">Child1</Child>
</Root>

Usually in orde开发者_如何学Cr to verify such an xml one would use the following xml schema:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Root">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Child">
          <xs:complexType>
            <xs:attribute name="name" type="xs:string" use="required" />
            <xs:attribute name="compareMode" type="xs:string" use="required" />
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

I want to limit values of a Child element and allow only the following: Child1, Child2 and Child3.

I know that usually restriction may be specified with the following schema:

<xs:restriction base="xs:string">
  <xs:enumeration value="Child1"/>
  <xs:enumeration value="Child2"/>
  <xs:enumeration value="Child3"/>
</xs:restriction>                    

Which restriction is correct in the first case?

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Does this answer your question?

Having both an attribute and a restriction on an element in xml schema

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I was wrong, because I didn't test my answer. I edited it:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:simpleType name="ChildContent">
        <xs:restriction base="xs:string">
            <xs:enumeration value="Child1"/>
            <xs:enumeration value="Child2"/>
            <xs:enumeration value="Child3"/>
        </xs:restriction>
    </xs:simpleType>
    <xs:complexType name="Child">
        <xs:simpleContent>
            <xs:extension base="ChildContent">
                <xs:attribute name="name" type="xs:string" use="required" />
                <xs:attribute name="compareMode" type="xs:string" use="required" />
            </xs:extension>     
        </xs:simpleContent>
    </xs:complexType>
    <xs:element name="Root">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="Child" type="Child" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

or with restriction:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:complexType name="Child">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="name" type="xs:string" use="required" />
                <xs:attribute name="compareMode" type="xs:string" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    <xs:element name="Root">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="Child">
                    <xs:complexType>
                        <xs:simpleContent>
                            <xs:restriction base="Child">
                                <xs:enumeration value="Child1"/>
                                <xs:enumeration value="Child2"/>
                                <xs:enumeration value="Child3"/>
                            </xs:restriction>     
                        </xs:simpleContent>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

After hours spent with google: You cannot do this without named types.