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

1. XML Tutorial
2. XML Schema
3. maxLength

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="description">
    <xsd:simpleType>
      <xsd:restriction base="xsd:string">
        <xsd:maxLength value="200" />
      </xsd:restriction>
    </xsd:simpleType>
  </xsd:element>
</xsd:schema>

 

File: Data.xml 
<?xml version="1.0"?>
<description xmlns="http://www.java2s.com">test</description>