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.java2java.com" xmlns="http://www.java2java.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.java2java.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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