how interpretation churned elements xml schema same name opposite charge value allowed?

i emanate xml schema brick xml, i shorten values "name" attribute, cost request wholly instance certified any week day:

<a>
  <day name="monday" />
  <day name="tuesday" />
  <day name="wednesday" />
</a>

i have attempted this:

 <xs:complextype name="a">
  <xs:sequence>
    <xs:element name="day" minoccurs="1" maxoccurs="1">
      <xs:complextype>
        <xs:attribute name="name" use="required">
          <xs:simpletype>
            <xs:restriction base="xs:string">
              <xs:enumeration value="monday" />
            </xs:restriction>
          </xs:simpletype>
        </xs:attribute>
      </xs:complextype>
    </xs:element>
    <xs:element name="day" minoccurs="1" maxoccurs="1">
      <xs:complextype>
        <xs:attribute name="name" use="required">
          <xs:simpletype>
            <xs:restriction base="xs:string">
              <xs:enumeration value="tuesday" />
            </xs:restriction>
          </xs:simpletype>
        </xs:attribute>
      </xs:complextype>
    </xs:element>
  </xs:sequence>
</xs:complextype>

but xml schema validator obscure says blunder "multiple elements name 'day', opposite types, seem denote group.".

is there any way?