A fixed number of units can be specified using the length facet : length « XML Schema « XML Tutorial

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XML Tutorial » XML Schema » length 
3. 64. 2. A fixed number of units can be specified using the length facet
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.java2java.com" xmlns="http://www.java2java.com"
  elementFormDefault="qualified">

  <xs:simpleType name="USA_SSN">
    <xs:restriction base="xs:string">
      <xs:length value="11" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

Any of the following values would therefore, be valid for an ssn element that uses the USA_SSN datatype: 
<ssn>123-45-6789</ssn>
<ssn>abcdefghijk</ssn>
<ssn>$   2345.42</ssn>
3. 64. length
3. 64. 1. To specify the exact length of an element
3. 64. 2. A fixed number of units can be specified using the length facet
3. 64. 3. length Defines the number of units of length using a nonnegative integer
3. 64. 4. Restrict the length of the text node
3. 64. 5. Restricting a type derived from the built-in string type to have a one-character length
3. 64. 6. Restrict the length of the code string and the characters
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