A Verifier Class as in JDOM

package org.jdom;

public final class Verifier {

  public static final String checkElementName(String name) {}
  public static final String checkAttributeName(String name) {}
  public static final String checkCharacterData(String text) {}
  public static final String checkNamespacePrefix(String prefix) {}
  public static final String checkNamespaceURI(String uri) {}
  public static final String checkProcessingInstructionTarget(String target) {}
  public static final String checkCommentData(String data) {}
 
  public static boolean isXMLCharacter(char c) {}
  public static boolean isXMLNameCharacter(char c) {}
  public static boolean isXMLNameStartCharacter(char c) {}
  public static boolean isXMLLetterOrDigit(char c) {}
  public static boolean isXMLLetter(char c) {}
  public static boolean isXMLCombiningChar(char c) {}
  public static boolean isXMLExtender(char c) {}
  public static boolean isXMLDigit(char c) {}

}