To specify the exact length of an element : length « XML Schema « XML Tutorial

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XML Tutorial » XML Schema » length 
3.64.1.To specify the exact length of an element
If you specify the length, you cannot specify the maximum or minimum (or vice versa).
The values for xsd:length, xsd:minLength, and xsd:maxLength must all be non-negative integers.
If the element is based on a binary type, the length limits the number of octets of binary data. 
If the element is derived by list, the length determines the number of list items.


File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.java2s.com" xmlns="http://www.java2s.com"
  elementFormDefault="qualified">
  
  <xsd:element name="animal_code">
    <xsd:simpleType>
      <xsd:restriction base="xsd:string">
        <xsd:length value="4" />
      </xsd:restriction>
    </xsd:simpleType>
  </xsd:element>
</xsd:schema>
 
File: Data.xml
<?xml version="1.0"?>
<animal_code xmlns="http://www.java2s.com">TIGR</animal_code>
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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