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Jing is a validator for RELAX NG and other schema languages. This project was taken from http://code.google.com/p/jing-trang and mavenized for inclusion in the Wicket Stuff HTML Validator. The code was taken from the 20091111 release.

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package com.thaiopensource.relaxng.pattern;

import com.thaiopensource.xml.util.Name;

import java.util.Set;

/**
 * Implements a function on a pattern that returns the set of required elements.
 * The return value is a non-null Set each member of is a non-null Name. Note that
 * in the schema element foo|bar { text }, neither foo nor bar are required elements.
 */
public class RequiredElementsFunction extends RequiredElementsOrAttributesFunction {
  public Set caseElement(ElementPattern p) {
    return caseNamed(p.getNameClass());
  }

  public Set caseGroup(GroupPattern p) {
    Pattern p1 = p.getOperand1();
    if (!p1.isNullable())
      return p1.apply(this);
    return p.getOperand2().apply(this);
  }
}