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XSD Restrictions

I'm trying to set some field lengths in an xsd but I get errors when using it to validate.

My XSD is as follows
<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="ContactDetails" type="Contact"/>

  <xs:complexType name="Contact">
    <xs:sequence>
      <xs:element name="Surname" type="xs:string"/>
      <xs:element name="Firstname" type="xs:string"/>
      <xs:sequence>
        <xs:element name="Addresses">
          <xs:complexType>
            <xs:sequence maxOccurs="unbounded">
              <xs:element name="Address" type="Address"/>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="Address">
    <xs:sequence>
      <xs:element name="Line1" type="xs:nvarchar120" minOccurs="1"/>
      <xs:element name="Line2" type="xs:string" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
  
  <xs:simpleType name="nvarchar120">
    <xs:restriction base="xs:string">
      <xs:minLength value="0"/>
      <xs:maxLength value="120"/>
    </xs:restriction>
  </xs:simpleType>

</xs:schema>

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I have 100's of fields to add and 60% are probably nvarchar120 in size. So this seems the best way to add this restriction to the xsd. However I can't see what's wrong with the above.

Help is appreciated.

For Reference the error I get is
"The 'http://www.w3.org/2001/XMLSchema:restriction' element is not supported in this context."
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