src/test/testData/structure/validation-structure.xml

<?xml version="1.0" encoding="UTF-8" ?>

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<!DOCTYPE validators PUBLIC
    "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
    "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators>

  <validator type="required">
    <param name="validatorParam">value</param>
    <message>anything</message>
  </validator>

  <field name="myField">
    <field-validator type="fieldexpression">
      <param name="expression">ANYTHING_FIX_ME</param>
      <message>anything</message>
    </field-validator>
  </field>


</validators>