/*-- 

 $Id: Verifier.java,v 1.23 2001/04/27 18:21:20 jhunter Exp $

 Copyright (C) 2000 Brett McLaughlin & Jason Hunter.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions, and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions, and the disclaimer that follows 
    these conditions in the documentation and/or other materials 
    provided with the distribution.

 3. The name "JDOM" must not be used to endorse or promote products
    derived from this software without prior written permission.  For
    written permission, please contact license@jdom.org.
 
 4. Products derived from this software may not be called "JDOM", nor
    may "JDOM" appear in their name, without prior written permission
    from the JDOM Project Management (pm@jdom.org).
 
 In addition, we request (but do not require) that you include in the 
 end-user documentation provided with the redistribution and/or in the 
 software itself an acknowledgement equivalent to the following:
     "This product includes software developed by the
      JDOM Project (http://www.jdom.org/)."
 Alternatively, the acknowledgment may be graphical using the logos 
 available at http://www.jdom.org/images/logos.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 This software consists of voluntary contributions made by many 
 individuals on behalf of the JDOM Project and was originally 
 created by Brett McLaughlin <brett@jdom.org> and 
 Jason Hunter <jhunter@jdom.org>.  For more information on the 
 JDOM Project, please see <http://www.jdom.org/>.
 
 */

package org.jdom;

/**
 * <p>
 * <code>Verifier</code> handles XML checks on names, data, and other
 *   verification tasks for JDOM.
 * </p>
 *
 * @author Brett McLaughlin
 * @author Elliotte Rusty Harold
 * @author Jason Hunter
 * @version 1.0
 */
public final class Verifier {

    private static final String CVS_ID = 
      "@(#) $RCSfile: Verifier.java,v $ $Revision: 1.23 $ $Date: 2001/04/27 18:21:20 $ $Name: jdom_1_0_b7_rc4 $";

    /**
     * <p>
     *  Ensure instantation cannot occur.
     * </p>
     */
    private Verifier() { }

    /**
     * <p>
     *  This will check the supplied name to see if it valid for use as
     *    a JDOM <code>{@link Element}</code> name.
     * </p>
     *
     * @param name <code>String</code> name to check.
     * @return <code>String</code> - reason name is invalid, or
     *         <code>null</code> if name is OK.
     */
    public static final String checkElementName(String name) {
        // Check basic XML name rules first
        String reason;
        if ((reason = checkXMLName(name)) != null) {
            return reason;
        }

        // No colons allowed, since elements handle this internally
        if (name.indexOf(":") != -1) {
            return "Element names cannot contain colons";
        }

        // If we got here, everything is OK
        return null;
    }

    /**
     * <p>
     *  This will check the supplied name to see if it valid for use as
     *    a JDOM <code>{@link Attribute}</code> name.
     * </p>
     *
     * @param name <code>String</code> name to check.
     * @return <code>String</code> - reason name is invalid, or
     *         <code>null</code> if name is OK.
     */
    public static final String checkAttributeName(String name) {
        // Check basic XML name rules first
        String reason;
        if ((reason = checkXMLName(name)) != null) {
            return reason;
        }

        // Allow xml:space and xml:lang as special cases
        if (name.equals("xml:space") ||
            name.equals("xml:lang")) {
            return null;
        }

        // Otherwise, no colons are allowed,
        // since attributes handle this internally
        if (name.indexOf(":") != -1) {
            return "Attribute names cannot contain colons";
        }

        // Attribute names may not be xmlns since we do this internally too
        if (name.equals("xmlns")) {
            return "An Attribute name may not be \"xmlns\"; " +
                   "use the Namespace class to manage namespaces";
        }

        // If we got here, everything is OK
        return null;
    }
    
    /**
     * <p>
     *  This will check the supplied string to see if it only contains
     *  characters allowed by the XML 1.0 specification. The C0 controls
     *  (e.g. null, vertical tab, formfeed, etc.) are specifically excluded
     *  except for carriage return, linefeed, and the horizontal tab.
     *  Surrogates are also excluded. 
     *  </p>
     *  <p>
     *  This method is useful for checking element content and attribute
     *  values. Note that characters 
     *  like " and &lt; are allowed in attribute values and element content. 
     *  They will simply be escaped as &quot; or &lt; 
     *  when the value is serialized. 
     * </p>
     *
     * @param name <code>String</code> value to check.
     * @return <code>String</code> - reason name is invalid, or
     *         <code>null</code> if name is OK.
     */
    public static final String checkCharacterData(String text) {
        if (text == null) {
            return "A null is not a legal XML value";
        }

        // do check
        for (int i = 0, len = text.length(); i<len; i++) {
            if (!isXMLCharacter(text.charAt(i))) {
                // Likely this character can't be easily displayed
                // because it's a control so we use it'd hexadecimal 
                // representation in the reason.
                return ("0x" + Integer.toHexString(text.charAt(i)) 
                 + " is not a legal XML character");    
            }       
        }

        // If we got here, everything is OK
        return null;
    }

    /**
     * <p>
     *  This will ensure that the data for a <code>{@link CDATA}</code>
     *    section is appropriate.
     * </p>
     *
     * @param data <code>String</code> data to check.
     * @return <code>String</code> - reason data is invalid, or
     *         <code>null</code> is name is OK.
     */
    public static final String checkCDATASection(String data) {
        String reason = null;
        if ((reason = checkCharacterData(data)) != null) {
            return reason;
        }

        if (data.indexOf("]]>") != -1) {
            return "CDATA cannot internally contain a CDATA ending " +
                   "delimiter (]]>)";
        }

        // If we got here, everything is OK
        return null;
    }

    /**
     * <p>
     *  This will check the supplied name to see if it valid for use as
     *    a JDOM <code>{@link Namespace}</code> prefix.
     * </p>
     *
     * @param prefix <code>String</code> prefix to check.
     * @return <code>String</code> - reason name is invalid, or
     *         <code>null</code> if name is OK.
     */
    public static final String checkNamespacePrefix(String prefix) {
        // Manually do rules, since URIs can be null or empty
        if ((prefix == null) || (prefix.equals(""))) {
            return null;
        }

        // Cannot start with a number
        char first = prefix.charAt(0);
        if (isXMLDigit(first)) {
            return "Namespace prefixes cannot begin with a number";
        }
        // Cannot start with a $
        if (first == '$') {
            return "Namespace prefixes cannot begin with a dollar sign ($)";
        }
        // Cannot start with a -
        if (first == '-') {
            return "Namespace prefixes cannot begin with a hyphen (-)";
        }
        // Cannot start with a .
        if (first == '.') {
            return "Namespace prefixes cannot begin with a period (.)";
        }
        // Cannot start with "xml" in any character case
        if (prefix.toLowerCase().startsWith("xml")) {
            return "Namespace prefixes cannot begin with " +
                   "\"xml\" in any combination of case";
        }

        // Ensure valid content
        for (int i=0, len = prefix.length(); i<len; i++) {
            char c = prefix.charAt(i);
            if (!isXMLNameCharacter(c)) {
                return "Namespace prefixes cannot contain the character \"" +
                        c + "\"";
            }
        }

        // No colons allowed
        if (prefix.indexOf(":") != -1) {
            return "Namespace prefixes cannot contain colons";
        }

        // If we got here, everything is OK
        return null;
    }

    /**
     * <p>
     *  This will check the supplied name to see if it valid for use as
     *    a JDOM <code>{@link Namespace}</code> URI.
     * </p>
     *
     * @param uri <code>String</code> URI to check.
     * @return <code>String</code> - reason name is invalid, or
     *         <code>null</code> if name is OK.
     */
    public static final String checkNamespaceURI(String uri) {
        // Manually do rules, since URIs can be null or empty
        if ((uri == null) || (uri.equals(""))) {
            return null;
        }

        // Cannot start with a number
        char first = uri.charAt(0);
        if (Character.isDigit(first)) {
            return "Namespace URIs cannot begin with a number";
        }
        // Cannot start with a $
        if (first == '$') {
            return "Namespace URIs cannot begin with a dollar sign ($)";
        }
        // Cannot start with a -
        if (first == '-') {
            return "Namespace URIs cannot begin with a hyphen (-)";
        }

        // If we got here, everything is OK
        return null;
    }

    /**
     * <p>
     *  This will check the supplied name to see if it valid for use as
     *    a JDOM processing instruction target.
     * </p>
     *
     * @param target <code>String</code> target to check.
     * @return <code>String</code> - reason target is invalid, or
     *         <code>null</code> if name is OK.
     */
    public static final String checkProcessingInstructionTarget(String target) {
        // Check basic XML name rules first
        String reason;
        if ((reason = checkXMLName(target)) != null) {
            return reason;
        }

        // No colons allowed, per Namespace Specification Section 6
        if (target.indexOf(":") != -1) {
            return "Processing instruction targets cannot contain colons";
        }

        // Cannot begin with 'xml' in any case
        if (target.equalsIgnoreCase("xml")) {
            return "Processing instructions cannot have a target of " +
                   "\"xml\" in any combination of case";
        }

        // If we got here, everything is OK
        return null;
    }

    /**
     * <p>
     *  This will ensure that the data for a <code>{@link Comment}</code>
     *    is appropriate.
     * </p>
     *
     * @param data <code>String</code> data to check.
     * @return <code>String</code> - reason data is invalid, or
     *         <code>null</code> is name is OK.
     */
    public static final String checkCommentData(String data) {
        String reason = null;
        if ((reason = checkCharacterData(data)) != null) {
            return reason;
        }

        if (data.indexOf("--") != -1) {
            return "Comments cannot contain double hyphens (--)";
        }

        // If we got here, everything is OK
        return null;
    }

    /**
     * <p>
     *  This is a utility function for sharing the base process of checking
     *    any XML name.
     * </p>
     *
     * @param name <code>String</code> to check for XML name compliance.
     * @return <code>String</code> - reason the name is invalid, or
     *         <code>null</code> if OK.
     */
    private static String checkXMLName(String name) {
        // Cannot be empty or null
        if ((name == null) || (name.length() == 0) 
                           || (name.trim().equals(""))) {
            return "XML names cannot be null or empty";
        }

      
        // Cannot start with a number
        char first = name.charAt(0);
        if (!isXMLNameStartCharacter(first)) {
            return "XML names cannot begin with the character \"" + 
                   first + "\"";
        }
        // Ensure valid content
        for (int i=0, len = name.length(); i<len; i++) {
            char c = name.charAt(i);
            if (!isXMLNameCharacter(c)) {
                return "XML names cannot contain the character \"" + c + "\"";
            }
        }

        // We got here, so everything is OK
        return null;
    }


    /**
     * <p>
     *  This is a utility function for determining whether a specified 
     *  character is a character according to production 2 of the 
     *  XML 1.0 specification.
     * </p>
     *
     * @param c <code>char</code> to check for XML compliance.
     * @return <code>boolean</code> - true if it's a character, 
     *                                false otherwise.
     */
    public static boolean isXMLCharacter(char c) {
    
        if (c == '\n') return true;
        if (c == '\r') return true;
        if (c == '\t') return true;
        
        if (c < 0x20) return false;  if (c <= 0xD7FF) return true;
        if (c < 0xE000) return false;  if (c <= 0xFFFD) return true;
        if (c < 0x10000) return false;  if (c <= 0x10FFFF) return true;
        
        return false;
    }


    /**
     * <p>
     *  This is a utility function for determining whether a specified 
     *  character is a name character according to production 4 of the 
     *  XML 1.0 specification.
     * </p>
     *
     * @param c <code>char</code> to check for XML name compliance.
     * @return <code>boolean</code> - true if it's a name character, 
     *                                false otherwise.
     */
    public static boolean isXMLNameCharacter(char c) {
    
      return (isXMLLetter(c) || isXMLDigit(c) || c == '.' || c == '-' 
                             || c == '_' || c == ':' || isXMLCombiningChar(c) 
                             || isXMLExtender(c));
    }

    /**
     * <p>
     *  This is a utility function for determining whether a specified 
     *  character is a legal name start character according to production 5
     *  of the XML 1.0 specification. This production does allow names
     *  to begin with colons which the Namespaces in XML Recommendation
     *  disallows. 
     * </p>
     *
     * @param c <code>char</code> to check for XML name start compliance.
     * @return <code>boolean</code> - true if it's a name start character, 
     *                                false otherwise.
     */
    public static boolean isXMLNameStartCharacter(char c) {
    
      return (isXMLLetter(c) || c == '_' || c ==':');
    
    }

    /**
     * <p>
     *  This is a utility function for determining whether a specified 
     *  character is a letter or digit according to productions 84 and 88
     *  of the XML 1.0 specification.
     * </p>
     *
     * @param c <code>char</code> to check.
     * @return <code>boolean</code> - true if it's letter or digit, 
     *                                false otherwise.
     */
    public static boolean isXMLLetterOrDigit(char c) {
    
      return (isXMLLetter(c) || isXMLDigit(c));
    
    }

    /**
     * <p>
     *  This is a utility function for determining whether a specified character
     *  is a letter according to production 84 of the XML 1.0 specification.
     * </p>
     *
     * @param c <code>char</code> to check for XML name compliance.
     * @return <code>String</code> - true if it's a letter, false otherwise.
     */
    public static boolean isXMLLetter(char c) {
        // Note that order is very important here.  The search proceeds 
        // from lowest to highest values, so that no searching occurs 
        // above the character's value.  BTW, the first line is equivalent to:
        // if (c >= 0x0041 && c <= 0x005A) return true;

        if (c < 0x0041) return false;  if (c <= 0x005a) return true;
        if (c < 0x0061) return false;  if (c <= 0x007A) return true;
        if (c < 0x00C0) return false;  if (c <= 0x00D6) return true;
        if (c < 0x00D8) return false;  if (c <= 0x00F6) return true;
        if (c < 0x00F8) return false;  if (c <= 0x00FF) return true;
        if (c < 0x0100) return false;  if (c <= 0x0131) return true;
        if (c < 0x0134) return false;  if (c <= 0x013E) return true;
        if (c < 0x0141) return false;  if (c <= 0x0148) return true;
        if (c < 0x014A) return false;  if (c <= 0x017E) return true;
        if (c < 0x0180) return false;  if (c <= 0x01C3) return true;
        if (c < 0x01CD) return false;  if (c <= 0x01F0) return true;
        if (c < 0x01F4) return false;  if (c <= 0x01F5) return true;
        if (c < 0x01FA) return false;  if (c <= 0x0217) return true;
        if (c < 0x0250) return false;  if (c <= 0x02A8) return true;
        if (c < 0x02BB) return false;  if (c <= 0x02C1) return true;
        if (c == 0x0386) return true;
        if (c < 0x0388) return false;  if (c <= 0x038A) return true;
        if (c == 0x038C) return true;
        if (c < 0x038E) return false;  if (c <= 0x03A1) return true;
        if (c < 0x03A3) return false;  if (c <= 0x03CE) return true;
        if (c < 0x03D0) return false;  if (c <= 0x03D6) return true;
        if (c == 0x03DA) return true;
        if (c == 0x03DC) return true;
        if (c == 0x03DE) return true;
        if (c == 0x03E0) return true;
        if (c < 0x03E2) return false;  if (c <= 0x03F3) return true;
        if (c < 0x0401) return false;  if (c <= 0x040C) return true;
        if (c < 0x040E) return false;  if (c <= 0x044F) return true;
        if (c < 0x0451) return false;  if (c <= 0x045C) return true;
        if (c < 0x045E) return false;  if (c <= 0x0481) return true;
        if (c < 0x0490) return false;  if (c <= 0x04C4) return true;
        if (c < 0x04C7) return false;  if (c <= 0x04C8) return true;
        if (c < 0x04CB) return false;  if (c <= 0x04CC) return true;
        if (c < 0x04D0) return false;  if (c <= 0x04EB) return true;
        if (c < 0x04EE) return false;  if (c <= 0x04F5) return true;
        if (c < 0x04F8) return false;  if (c <= 0x04F9) return true;
        if (c < 0x0531) return false;  if (c <= 0x0556) return true;
        if (c == 0x0559) return true;
        if (c < 0x0561) return false;  if (c <= 0x0586) return true;
        if (c < 0x05D0) return false;  if (c <= 0x05EA) return true;
        if (c < 0x05F0) return false;  if (c <= 0x05F2) return true;
        if (c < 0x0621) return false;  if (c <= 0x063A) return true;
        if (c < 0x0641) return false;  if (c <= 0x064A) return true;
        if (c < 0x0671) return false;  if (c <= 0x06B7) return true;
        if (c < 0x06BA) return false;  if (c <= 0x06BE) return true;
        if (c < 0x06C0) return false;  if (c <= 0x06CE) return true;
        if (c < 0x06D0) return false;  if (c <= 0x06D3) return true;
        if (c == 0x06D5) return true;
        if (c < 0x06E5) return false;  if (c <= 0x06E6) return true;
        if (c < 0x0905) return false;  if (c <= 0x0939) return true;
        if (c == 0x093D) return true;
        if (c < 0x0958) return false;  if (c <= 0x0961) return true;
        if (c < 0x0985) return false;  if (c <= 0x098C) return true;
        if (c < 0x098F) return false;  if (c <= 0x0990) return true;
        if (c < 0x0993) return false;  if (c <= 0x09A8) return true;
        if (c < 0x09AA) return false;  if (c <= 0x09B0) return true;
        if (c == 0x09B2) return true;
        if (c < 0x09B6) return false;  if (c <= 0x09B9) return true;
        if (c < 0x09DC) return false;  if (c <= 0x09DD) return true;
        if (c < 0x09DF) return false;  if (c <= 0x09E1) return true;
        if (c < 0x09F0) return false;  if (c <= 0x09F1) return true;
        if (c < 0x0A05) return false;  if (c <= 0x0A0A) return true;
        if (c < 0x0A0F) return false;  if (c <= 0x0A10) return true;
        if (c < 0x0A13) return false;  if (c <= 0x0A28) return true;
        if (c < 0x0A2A) return false;  if (c <= 0x0A30) return true;
        if (c < 0x0A32) return false;  if (c <= 0x0A33) return true;
        if (c < 0x0A35) return false;  if (c <= 0x0A36) return true;
        if (c < 0x0A38) return false;  if (c <= 0x0A39) return true;
        if (c < 0x0A59) return false;  if (c <= 0x0A5C) return true;
        if (c == 0x0A5E) return true;
        if (c < 0x0A72) return false;  if (c <= 0x0A74) return true;
        if (c < 0x0A85) return false;  if (c <= 0x0A8B) return true;
        if (c == 0x0A8D) return true;
        if (c < 0x0A8F) return false;  if (c <= 0x0A91) return true;
        if (c < 0x0A93) return false;  if (c <= 0x0AA8) return true;
        if (c < 0x0AAA) return false;  if (c <= 0x0AB0) return true;
        if (c < 0x0AB2) return false;  if (c <= 0x0AB3) return true;
        if (c < 0x0AB5) return false;  if (c <= 0x0AB9) return true;
        if (c == 0x0ABD) return true;
        if (c == 0x0AE0) return true;
        if (c < 0x0B05) return false;  if (c <= 0x0B0C) return true;
        if (c < 0x0B0F) return false;  if (c <= 0x0B10) return true;
        if (c < 0x0B13) return false;  if (c <= 0x0B28) return true;
        if (c < 0x0B2A) return false;  if (c <= 0x0B30) return true;
        if (c < 0x0B32) return false;  if (c <= 0x0B33) return true;
        if (c < 0x0B36) return false;  if (c <= 0x0B39) return true;
        if (c == 0x0B3D) return true;
        if (c < 0x0B5C) return false;  if (c <= 0x0B5D) return true;
        if (c < 0x0B5F) return false;  if (c <= 0x0B61) return true;
        if (c < 0x0B85) return false;  if (c <= 0x0B8A) return true;
        if (c < 0x0B8E) return false;  if (c <= 0x0B90) return true;
        if (c < 0x0B92) return false;  if (c <= 0x0B95) return true;
        if (c < 0x0B99) return false;  if (c <= 0x0B9A) return true;
        if (c == 0x0B9C) return true;
        if (c < 0x0B9E) return false;  if (c <= 0x0B9F) return true;
        if (c < 0x0BA3) return false;  if (c <= 0x0BA4) return true;
        if (c < 0x0BA8) return false;  if (c <= 0x0BAA) return true;
        if (c < 0x0BAE) return false;  if (c <= 0x0BB5) return true;
        if (c < 0x0BB7) return false;  if (c <= 0x0BB9) return true;
        if (c < 0x0C05) return false;  if (c <= 0x0C0C) return true;
        if (c < 0x0C0E) return false;  if (c <= 0x0C10) return true;
        if (c < 0x0C12) return false;  if (c <= 0x0C28) return true;
        if (c < 0x0C2A) return false;  if (c <= 0x0C33) return true;
        if (c < 0x0C35) return false;  if (c <= 0x0C39) return true;
        if (c < 0x0C60) return false;  if (c <= 0x0C61) return true;
        if (c < 0x0C85) return false;  if (c <= 0x0C8C) return true;
        if (c < 0x0C8E) return false;  if (c <= 0x0C90) return true;
        if (c < 0x0C92) return false;  if (c <= 0x0CA8) return true;
        if (c < 0x0CAA) return false;  if (c <= 0x0CB3) return true;
        if (c < 0x0CB5) return false;  if (c <= 0x0CB9) return true;
        if (c == 0x0CDE) return true;
        if (c < 0x0CE0) return false;  if (c <= 0x0CE1) return true;
        if (c < 0x0D05) return false;  if (c <= 0x0D0C) return true;
        if (c < 0x0D0E) return false;  if (c <= 0x0D10) return true;
        if (c < 0x0D12) return false;  if (c <= 0x0D28) return true;
        if (c < 0x0D2A) return false;  if (c <= 0x0D39) return true;
        if (c < 0x0D60) return false;  if (c <= 0x0D61) return true;
        if (c < 0x0E01) return false;  if (c <= 0x0E2E) return true;
        if (c == 0x0E30) return true;
        if (c < 0x0E32) return false;  if (c <= 0x0E33) return true;
        if (c < 0x0E40) return false;  if (c <= 0x0E45) return true;
        if (c < 0x0E81) return false;  if (c <= 0x0E82) return true;
        if (c == 0x0E84) return true;
        if (c < 0x0E87) return false;  if (c <= 0x0E88) return true;
        if (c == 0x0E8A) return true;
        if (c == 0x0E8D) return true;
        if (c < 0x0E94) return false;  if (c <= 0x0E97) return true;
        if (c < 0x0E99) return false;  if (c <= 0x0E9F) return true;
        if (c < 0x0EA1) return false;  if (c <= 0x0EA3) return true;
        if (c == 0x0EA5) return true;
        if (c == 0x0EA7) return true;
        if (c < 0x0EAA) return false;  if (c <= 0x0EAB) return true;
        if (c < 0x0EAD) return false;  if (c <= 0x0EAE) return true;
        if (c == 0x0EB0) return true;
        if (c < 0x0EB2) return false;  if (c <= 0x0EB3) return true;
        if (c == 0x0EBD) return true;
        if (c < 0x0EC0) return false;  if (c <= 0x0EC4) return true;
        if (c < 0x0F40) return false;  if (c <= 0x0F47) return true;
        if (c < 0x0F49) return false;  if (c <= 0x0F69) return true;
        if (c < 0x10A0) return false;  if (c <= 0x10C5) return true;
        if (c < 0x10D0) return false;  if (c <= 0x10F6) return true;
        if (c == 0x1100) return true;
        if (c < 0x1102) return false;  if (c <= 0x1103) return true;
        if (c < 0x1105) return false;  if (c <= 0x1107) return true;
        if (c == 0x1109) return true;
        if (c < 0x110B) return false;  if (c <= 0x110C) return true;
        if (c < 0x110E) return false;  if (c <= 0x1112) return true;
        if (c == 0x113C) return true;
        if (c == 0x113E) return true;
        if (c == 0x1140) return true;
        if (c == 0x114C) return true;
        if (c == 0x114E) return true;
        if (c == 0x1150) return true;
        if (c < 0x1154) return false;  if (c <= 0x1155) return true;
        if (c == 0x1159) return true;
        if (c < 0x115F) return false;  if (c <= 0x1161) return true;
        if (c == 0x1163) return true;
        if (c == 0x1165) return true;
        if (c == 0x1167) return true;
        if (c == 0x1169) return true;
        if (c < 0x116D) return false;  if (c <= 0x116E) return true;
        if (c < 0x1172) return false;  if (c <= 0x1173) return true;
        if (c == 0x1175) return true;
        if (c == 0x119E) return true;
        if (c == 0x11A8) return true;
        if (c == 0x11AB) return true;
        if (c < 0x11AE) return false;  if (c <= 0x11AF) return true;
        if (c < 0x11B7) return false;  if (c <= 0x11B8) return true;
        if (c == 0x11BA) return true;
        if (c < 0x11BC) return false;  if (c <= 0x11C2) return true;
        if (c == 0x11EB) return true;
        if (c == 0x11F0) return true;
        if (c == 0x11F9) return true;
        if (c < 0x1E00) return false;  if (c <= 0x1E9B) return true;
        if (c < 0x1EA0) return false;  if (c <= 0x1EF9) return true;
        if (c < 0x1F00) return false;  if (c <= 0x1F15) return true;
        if (c < 0x1F18) return false;  if (c <= 0x1F1D) return true;
        if (c < 0x1F20) return false;  if (c <= 0x1F45) return true;
        if (c < 0x1F48) return false;  if (c <= 0x1F4D) return true;
        if (c < 0x1F50) return false;  if (c <= 0x1F57) return true;
        if (c == 0x1F59) return true;
        if (c == 0x1F5B) return true;
        if (c == 0x1F5D) return true;
        if (c < 0x1F5F) return false;  if (c <= 0x1F7D) return true;
        if (c < 0x1F80) return false;  if (c <= 0x1FB4) return true;
        if (c < 0x1FB6) return false;  if (c <= 0x1FBC) return true;
        if (c == 0x1FBE) return true;
        if (c < 0x1FC2) return false;  if (c <= 0x1FC4) return true;
        if (c < 0x1FC6) return false;  if (c <= 0x1FCC) return true;
        if (c < 0x1FD0) return false;  if (c <= 0x1FD3) return true;
        if (c < 0x1FD6) return false;  if (c <= 0x1FDB) return true;
        if (c < 0x1FE0) return false;  if (c <= 0x1FEC) return true;
        if (c < 0x1FF2) return false;  if (c <= 0x1FF4) return true;
        if (c < 0x1FF6) return false;  if (c <= 0x1FFC) return true;
        if (c == 0x2126) return true;
        if (c < 0x212A) return false;  if (c <= 0x212B) return true;
        if (c == 0x212E) return true;
        if (c < 0x2180) return false;  if (c <= 0x2182) return true;
        if (c == 0x3007) return true;                          // ideographic
        if (c < 0x3021) return false;  if (c <= 0x3029) return true;  // ideo
        if (c < 0x3041) return false;  if (c <= 0x3094) return true;
        if (c < 0x30A1) return false;  if (c <= 0x30FA) return true;
        if (c < 0x3105) return false;  if (c <= 0x312C) return true;
        if (c < 0x4E00) return false;  if (c <= 0x9FA5) return true;  // ideo
        if (c < 0xAC00) return false;  if (c <= 0xD7A3) return true;
      
        return false;
        
    }

    /**
     * <p>
     *  This is a utility function for determining whether a specified character
     *  is a combining character according to production 87
     *  of the XML 1.0 specification.
     * </p>
     *
     * @param c <code>char</code> to check.
     * @return <code>boolean</code> - true if it's a combining character,
     *         false otherwise.
     */
    public static boolean isXMLCombiningChar(char c) {
        // CombiningChar
        if (c < 0x0300) return false;  if (c <= 0x0345) return true;
        if (c < 0x0360) return false;  if (c <= 0x0361) return true;
        if (c < 0x0483) return false;  if (c <= 0x0486) return true;
        if (c < 0x0591) return false;  if (c <= 0x05A1) return true;
                                       
        if (c < 0x05A3) return false;  if (c <= 0x05B9) return true;
        if (c < 0x05BB) return false;  if (c <= 0x05BD) return true;
        if (c == 0x05BF) return true;
        if (c < 0x05C1) return false;  if (c <= 0x05C2) return true;
                                       
        if (c == 0x05C4) return true;
        if (c < 0x064B) return false;  if (c <= 0x0652) return true;
        if (c == 0x0670) return true;
        if (c < 0x06D6) return false;  if (c <= 0x06DC) return true;
                                       
        if (c < 0x06DD) return false;  if (c <= 0x06DF) return true;
        if (c < 0x06E0) return false;  if (c <= 0x06E4) return true;
        if (c < 0x06E7) return false;  if (c <= 0x06E8) return true;
                                       
        if (c < 0x06EA) return false;  if (c <= 0x06ED) return true;
        if (c < 0x0901) return false;  if (c <= 0x0903) return true;
        if (c == 0x093C) return true;
        if (c < 0x093E) return false;  if (c <= 0x094C) return true;
                                       
        if (c == 0x094D) return true;
        if (c < 0x0951) return false;  if (c <= 0x0954) return true;
        if (c < 0x0962) return false;  if (c <= 0x0963) return true;
        if (c < 0x0981) return false;  if (c <= 0x0983) return true;
                                       
        if (c == 0x09BC) return true;
        if (c == 0x09BE) return true;
        if (c == 0x09BF) return true;
        if (c < 0x09C0) return false;  if (c <= 0x09C4) return true;
        if (c < 0x09C7) return false;  if (c <= 0x09C8) return true;
                                       
        if (c < 0x09CB) return false;  if (c <= 0x09CD) return true;
        if (c == 0x09D7) return true;
        if (c < 0x09E2) return false;  if (c <= 0x09E3) return true;
        if (c == 0x0A02) return true;
        if (c == 0x0A3C) return true;
                                       
        if (c == 0x0A3E) return true;
        if (c == 0x0A3F) return true;
        if (c < 0x0A40) return false;  if (c <= 0x0A42) return true;
        if (c < 0x0A47) return false;  if (c <= 0x0A48) return true;
                                       
        if (c < 0x0A4B) return false;  if (c <= 0x0A4D) return true;
        if (c < 0x0A70) return false;  if (c <= 0x0A71) return true;
        if (c < 0x0A81) return false;  if (c <= 0x0A83) return true;
        if (c == 0x0ABC) return true;
                                       
        if (c < 0x0ABE) return false;  if (c <= 0x0AC5) return true;
        if (c < 0x0AC7) return false;  if (c <= 0x0AC9) return true;
        if (c < 0x0ACB) return false;  if (c <= 0x0ACD) return true;
                                       
        if (c < 0x0B01) return false;  if (c <= 0x0B03) return true;
        if (c == 0x0B3C) return true;
        if (c < 0x0B3E) return false;  if (c <= 0x0B43) return true;
        if (c < 0x0B47) return false;  if (c <= 0x0B48) return true;
                                       
        if (c < 0x0B4B) return false;  if (c <= 0x0B4D) return true;
        if (c < 0x0B56) return false;  if (c <= 0x0B57) return true;
        if (c < 0x0B82) return false;  if (c <= 0x0B83) return true;
                                       
        if (c < 0x0BBE) return false;  if (c <= 0x0BC2) return true;
        if (c < 0x0BC6) return false;  if (c <= 0x0BC8) return true;
        if (c < 0x0BCA) return false;  if (c <= 0x0BCD) return true;
        if (c == 0x0BD7) return true;
                                       
        if (c < 0x0C01) return false;  if (c <= 0x0C03) return true;
        if (c < 0x0C3E) return false;  if (c <= 0x0C44) return true;
        if (c < 0x0C46) return false;  if (c <= 0x0C48) return true;
                                       
        if (c < 0x0C4A) return false;  if (c <= 0x0C4D) return true;
        if (c < 0x0C55) return false;  if (c <= 0x0C56) return true;
        if (c < 0x0C82) return false;  if (c <= 0x0C83) return true;
                                       
        if (c < 0x0CBE) return false;  if (c <= 0x0CC4) return true;
        if (c < 0x0CC6) return false;  if (c <= 0x0CC8) return true;
        if (c < 0x0CCA) return false;  if (c <= 0x0CCD) return true;
                                       
        if (c < 0x0CD5) return false;  if (c <= 0x0CD6) return true;
        if (c < 0x0D02) return false;  if (c <= 0x0D03) return true;
        if (c < 0x0D3E) return false;  if (c <= 0x0D43) return true;
                                       
        if (c < 0x0D46) return false;  if (c <= 0x0D48) return true;
        if (c < 0x0D4A) return false;  if (c <= 0x0D4D) return true;
        if (c == 0x0D57) return true;
        if (c == 0x0E31) return true;
                                       
        if (c < 0x0E34) return false;  if (c <= 0x0E3A) return true;
        if (c < 0x0E47) return false;  if (c <= 0x0E4E) return true;
        if (c == 0x0EB1) return true;
        if (c < 0x0EB4) return false;  if (c <= 0x0EB9) return true;
                                       
        if (c < 0x0EBB) return false;  if (c <= 0x0EBC) return true;
        if (c < 0x0EC8) return false;  if (c <= 0x0ECD) return true;
        if (c < 0x0F18) return false;  if (c <= 0x0F19) return true;
        if (c == 0x0F35) return true;
                                       
        if (c == 0x0F37) return true;
        if (c == 0x0F39) return true;
        if (c == 0x0F3E) return true;
        if (c == 0x0F3F) return true;
        if (c < 0x0F71) return false;  if (c <= 0x0F84) return true;
                                       
        if (c < 0x0F86) return false;  if (c <= 0x0F8B) return true;
        if (c < 0x0F90) return false;  if (c <= 0x0F95) return true;
        if (c == 0x0F97) return true;
        if (c < 0x0F99) return false;  if (c <= 0x0FAD) return true;
                                       
        if (c < 0x0FB1) return false;  if (c <= 0x0FB7) return true;
        if (c == 0x0FB9) return true;
        if (c < 0x20D0) return false;  if (c <= 0x20DC) return true;
        if (c == 0x20E1) return true;
                                       
        if (c < 0x302A) return false;  if (c <= 0x302F) return true;
        if (c == 0x3099) return true;
        if (c == 0x309A) return true; 
        
        return false;
        
    }
    
    /**
     * <p>
     *  This is a utility function for determining whether a specified 
     *  character is an extender according to production 88 of the XML 1.0
     *  specification.
     * </p>
     *
     * @param c <code>char</code> to check.
     * @return <code>String</code> - true if it's an extender, false otherwise.
     */
    public static boolean isXMLExtender(char c) {

        if (c < 0x00B6) return false;  // quick short circuit

        // Extenders                               
        if (c == 0x00B7) return true;
        if (c == 0x02D0) return true;
        if (c == 0x02D1) return true;
        if (c == 0x0387) return true;
        if (c == 0x0640) return true;
        if (c == 0x0E46) return true;
        if (c == 0x0EC6) return true;
        if (c == 0x3005) return true;
                                       
        if (c < 0x3031) return false;  if (c <= 0x3035) return true;
        if (c < 0x309D) return false;  if (c <= 0x309E) return true;
        if (c < 0x30FC) return false;  if (c <= 0x30FE) return true;
        
        return false;
        
    }
      
    /**
     * <p>
     *  This is a utility function for determining whether a specified 
     *  Unicode character
     *  is a digit according to production 88 of the XML 1.0 specification.
     * </p>
     *
     * @param c <code>char</code> to check for XML digit compliance.
     * @return <code>boolean</code> - true if it's a digit, false otherwise.
     */
    public static boolean isXMLDigit(char c) {
      
        if (c < 0x0030) return false;  if (c <= 0x0039) return true;
        if (c < 0x0660) return false;  if (c <= 0x0669) return true;
        if (c < 0x06F0) return false;  if (c <= 0x06F9) return true;
        if (c < 0x0966) return false;  if (c <= 0x096F) return true;
                                       
        if (c < 0x09E6) return false;  if (c <= 0x09EF) return true;
        if (c < 0x0A66) return false;  if (c <= 0x0A6F) return true;
        if (c < 0x0AE6) return false;  if (c <= 0x0AEF) return true;
                                       
        if (c < 0x0B66) return false;  if (c <= 0x0B6F) return true;
        if (c < 0x0BE7) return false;  if (c <= 0x0BEF) return true;
        if (c < 0x0C66) return false;  if (c <= 0x0C6F) return true;
                                       
        if (c < 0x0CE6) return false;  if (c <= 0x0CEF) return true;
        if (c < 0x0D66) return false;  if (c <= 0x0D6F) return true;
        if (c < 0x0E50) return false;  if (c <= 0x0E59) return true;
                                       
        if (c < 0x0ED0) return false;  if (c <= 0x0ED9) return true;
        if (c < 0x0F20) return false;  if (c <= 0x0F29) return true; 
      
        return false;
      
    }    

    // ******************************************************************
    // Methods below here are included only for sanity checking's sake.
    // ******************************************************************

    private static boolean isXMLLetterOld(char c) {
        if (c >= 0x0041 && c <= 0x005A) return true;
        if (c >= 0x0061 && c <= 0x007A) return true;
        if (c >= 0x00C0 && c <= 0x00D6) return true;
        if (c >= 0x00D8 && c <= 0x00F6) return true;
        if (c >= 0x00F8 && c <= 0x00FF) return true;
        if (c >= 0x0100 && c <= 0x0131) return true;
        if (c >= 0x0134 && c <= 0x013E) return true;
        if (c >= 0x0141 && c <= 0x0148) return true;
        if (c >= 0x014A && c <= 0x017E) return true;
        if (c >= 0x0180 && c <= 0x01C3) return true;
        if (c >= 0x01CD && c <= 0x01F0) return true;
        if (c >= 0x01F4 && c <= 0x01F5) return true;
        if (c >= 0x01FA && c <= 0x0217) return true;
        if (c >= 0x0250 && c <= 0x02A8) return true;
        if (c >= 0x02BB && c <= 0x02C1) return true;
        if (c >= 0x0388 && c <= 0x038A) return true;
        if (c == 0x0386) return true;
        if (c == 0x038C) return true;
        if (c >= 0x038E && c <= 0x03A1) return true;
        if (c >= 0x03A3 && c <= 0x03CE) return true;
        if (c >= 0x03D0 && c <= 0x03D6) return true;
        if (c == 0x03DA) return true;
        if (c == 0x03DC) return true;
        if (c == 0x03DE) return true;
        if (c == 0x03E0) return true;
        if (c >= 0x03E2 && c <= 0x03F3) return true;
        if (c >= 0x0401 && c <= 0x040C) return true;
        if (c >= 0x040E && c <= 0x044F) return true;
        if (c >= 0x0451 && c <= 0x045C) return true;
        if (c >= 0x045E && c <= 0x0481) return true;
        if (c >= 0x0490 && c <= 0x04C4) return true;
        if (c >= 0x04C7 && c <= 0x04C8) return true;
        if (c >= 0x04CB && c <= 0x04CC) return true;
        if (c >= 0x04D0 && c <= 0x04EB) return true;
        if (c >= 0x04EE && c <= 0x04F5) return true;
        if (c >= 0x04F8 && c <= 0x04F9) return true;
        if (c >= 0x0531 && c <= 0x0556) return true;
        if (c == 0x0559) return true;
        if (c >= 0x0561 && c <= 0x0586) return true;
        if (c >= 0x05D0 && c <= 0x05EA) return true;
        if (c >= 0x05F0 && c <= 0x05F2) return true;
        if (c >= 0x0621 && c <= 0x063A) return true;
        if (c >= 0x0641 && c <= 0x064A) return true;
        if (c >= 0x0671 && c <= 0x06B7) return true;
        if (c >= 0x06BA && c <= 0x06BE) return true;
        if (c >= 0x06C0 && c <= 0x06CE) return true;
        if (c >= 0x06D0 && c <= 0x06D3) return true;
        if (c == 0x06D5) return true;
        if (c >= 0x06E5 && c <= 0x06E6) return true;
        if (c >= 0x0905 && c <= 0x0939) return true;
        if (c == 0x093D) return true;
        if (c >= 0x0958 && c <= 0x0961) return true;
        if (c >= 0x0985 && c <= 0x098C) return true;
        if (c >= 0x098F && c <= 0x0990) return true;
        if (c >= 0x0993 && c <= 0x09A8) return true;
        if (c >= 0x09AA && c <= 0x09B0) return true;
        if (c == 0x09B2) return true;
        if (c >= 0x09B6 && c <= 0x09B9) return true;
        if (c >= 0x09DC && c <= 0x09DD) return true;
        if (c >= 0x09DF && c <= 0x09E1) return true;
        if (c >= 0x09F0 && c <= 0x09F1) return true;
        if (c >= 0x0A05 && c <= 0x0A0A) return true;
        if (c >= 0x0A0F && c <= 0x0A10) return true;
        if (c >= 0x0A13 && c <= 0x0A28) return true;
        if (c >= 0x0A2A && c <= 0x0A30) return true;
        if (c >= 0x0A32 && c <= 0x0A33) return true;
        if (c >= 0x0A35 && c <= 0x0A36) return true;
        if (c >= 0x0A38 && c <= 0x0A39) return true;
        if (c >= 0x0A59 && c <= 0x0A5C) return true;
        if (c == 0x0A5E) return true;
        if (c >= 0x0A72 && c <= 0x0A74) return true;
        if (c >= 0x0A85 && c <= 0x0A8B) return true;
        if (c == 0x0A8D) return true;
        if (c >= 0x0A8F && c <= 0x0A91) return true;
        if (c >= 0x0A93 && c <= 0x0AA8) return true;
        if (c >= 0x0AAA && c <= 0x0AB0) return true;
        if (c >= 0x0AB2 && c <= 0x0AB3) return true;
        if (c >= 0x0AB5 && c <= 0x0AB9) return true;
        if (c == 0x0ABD) return true;
        if (c == 0x0AE0) return true;
        if (c >= 0x0B05 && c <= 0x0B0C) return true;
        if (c >= 0x0B0F && c <= 0x0B10) return true;
        if (c >= 0x0B13 && c <= 0x0B28) return true;
        if (c >= 0x0B2A && c <= 0x0B30) return true;
        if (c >= 0x0B32 && c <= 0x0B33) return true;
        if (c >= 0x0B36 && c <= 0x0B39) return true;
        if (c == 0x0B3D) return true;
        if (c >= 0x0B5C && c <= 0x0B5D) return true;
        if (c >= 0x0B5F && c <= 0x0B61) return true;
        if (c >= 0x0B85 && c <= 0x0B8A) return true;
        if (c >= 0x0B8E && c <= 0x0B90) return true;
        if (c >= 0x0B92 && c <= 0x0B95) return true;
        if (c >= 0x0B99 && c <= 0x0B9A) return true;
        if (c == 0x0B9C) return true;
        if (c >= 0x0B9E && c <= 0x0B9F) return true;
        if (c >= 0x0BA3 && c <= 0x0BA4) return true;
        if (c >= 0x0BA8 && c <= 0x0BAA) return true;
        if (c >= 0x0BAE && c <= 0x0BB5) return true;
        if (c >= 0x0BB7 && c <= 0x0BB9) return true;
        if (c >= 0x0C05 && c <= 0x0C0C) return true;
        if (c >= 0x0C0E && c <= 0x0C10) return true;
        if (c >= 0x0C12 && c <= 0x0C28) return true;
        if (c >= 0x0C2A && c <= 0x0C33) return true;
        if (c >= 0x0C35 && c <= 0x0C39) return true;
        if (c >= 0x0C60 && c <= 0x0C61) return true;
        if (c >= 0x0C85 && c <= 0x0C8C) return true;
        if (c >= 0x0C8E && c <= 0x0C90) return true;
        if (c >= 0x0C92 && c <= 0x0CA8) return true;
        if (c >= 0x0CAA && c <= 0x0CB3) return true;
        if (c >= 0x0CB5 && c <= 0x0CB9) return true;
        if (c == 0x0CDE) return true;
        if (c >= 0x0CE0 && c <= 0x0CE1) return true;
        if (c >= 0x0D05 && c <= 0x0D0C) return true;
        if (c >= 0x0D0E && c <= 0x0D10) return true;
        if (c >= 0x0D12 && c <= 0x0D28) return true;
        if (c >= 0x0D2A && c <= 0x0D39) return true;
        if (c >= 0x0D60 && c <= 0x0D61) return true;
        if (c >= 0x0E01 && c <= 0x0E2E) return true;
        if (c == 0x0E30) return true;
        if (c >= 0x0E32 && c <= 0x0E33) return true;
        if (c >= 0x0E40 && c <= 0x0E45) return true;
        if (c >= 0x0E81 && c <= 0x0E82) return true;
        if (c == 0x0E84) return true;
        if (c >= 0x0E87 && c <= 0x0E88) return true;
        if (c == 0x0E8A) return true;
        if (c == 0x0E8D) return true;
        if (c >= 0x0E94 && c <= 0x0E97) return true;
        if (c >= 0x0E99 && c <= 0x0E9F) return true;
        if (c >= 0x0EA1 && c <= 0x0EA3) return true;
        if (c == 0x0EA5) return true;
        if (c == 0x0EA7) return true;
        if (c >= 0x0EAA && c <= 0x0EAB) return true;
        if (c >= 0x0EAD && c <= 0x0EAE) return true;
        if (c == 0x0EB0) return true;
        if (c >= 0x0EB2 && c <= 0x0EB3) return true;
        if (c == 0x0EBD) return true;
        if (c >= 0x0EC0 && c <= 0x0EC4) return true;
        if (c >= 0x0F40 && c <= 0x0F47) return true;
        if (c >= 0x0F49 && c <= 0x0F69) return true;
        if (c >= 0x10A0 && c <= 0x10C5) return true;
        if (c >= 0x10D0 && c <= 0x10F6) return true;
        if (c == 0x1100) return true;
        if (c >= 0x1102 && c <= 0x1103) return true;
        if (c >= 0x1105 && c <= 0x1107) return true;
        if (c == 0x1109) return true;
        if (c >= 0x110B && c <= 0x110C) return true;
        if (c >= 0x110E && c <= 0x1112) return true;
        if (c == 0x113C) return true;
        if (c == 0x113E) return true;
        if (c == 0x1140) return true;
        if (c == 0x114C) return true;
        if (c == 0x114E) return true;
        if (c == 0x1150) return true;
        if (c >= 0x1154 && c <= 0x1155) return true;
        if (c == 0x1159) return true;
        if (c >= 0x115F && c <= 0x1161) return true;
        if (c == 0x1163) return true;
        if (c == 0x1165) return true;
        if (c == 0x1167) return true;
        if (c == 0x1169) return true;
        if (c >= 0x116D && c <= 0x116E) return true;
        if (c >= 0x1172 && c <= 0x1173) return true;
        if (c == 0x1175) return true;
        if (c == 0x119E) return true;
        if (c == 0x11A8) return true;
        if (c == 0x11AB) return true;
        if (c >= 0x11AE && c <= 0x11AF) return true;
        if (c >= 0x11B7 && c <= 0x11B8) return true;
        if (c == 0x11BA) return true;
        if (c >= 0x11BC && c <= 0x11C2) return true;
        if (c == 0x11EB) return true;
        if (c == 0x11F0) return true;
        if (c == 0x11F9) return true;
        if (c >= 0x1E00 && c <= 0x1E9B) return true;
        if (c >= 0x1EA0 && c <= 0x1EF9) return true;
        if (c >= 0x1F00 && c <= 0x1F15) return true;
        if (c >= 0x1F18 && c <= 0x1F1D) return true;
        if (c >= 0x1F20 && c <= 0x1F45) return true;
        if (c >= 0x1F48 && c <= 0x1F4D) return true;
        if (c >= 0x1F50 && c <= 0x1F57) return true;
        if (c == 0x1F59) return true;
        if (c == 0x1F5B) return true;
        if (c == 0x1F5D) return true;
        if (c >= 0x1F5F && c <= 0x1F7D) return true;
        if (c >= 0x1F80 && c <= 0x1FB4) return true;
        if (c >= 0x1FB6 && c <= 0x1FBC) return true;
        if (c == 0x1FBE) return true;
        if (c >= 0x1FC2 && c <= 0x1FC4) return true;
        if (c >= 0x1FC6 && c <= 0x1FCC) return true;
        if (c >= 0x1FD0 && c <= 0x1FD3) return true;
        if (c >= 0x1FD6 && c <= 0x1FDB) return true;
        if (c >= 0x1FE0 && c <= 0x1FEC) return true;
        if (c >= 0x1FF2 && c <= 0x1FF4) return true;
        if (c >= 0x1FF6 && c <= 0x1FFC) return true;
        if (c == 0x2126) return true;
        if (c >= 0x212A && c <= 0x212B) return true;
        if (c == 0x212E) return true;
        if (c >= 0x2180 && c <= 0x2182) return true;
        if (c >= 0x3041 && c <= 0x3094) return true;
        if (c >= 0x30A1 && c <= 0x30FA) return true;
        if (c >= 0x3105 && c <= 0x312C) return true;
        if (c >= 0xAC00 && c <= 0xD7A3) return true;
      
        // Ideographic
        if (c >= 0x4E00 && c <= 0x9FA5) return true;
        if (c == 0x3007) return true;
        if (c >= 0x3021 && c <= 0x3029) return true; 
      
        return false;
        
    }
    
    private static boolean isXMLDigitOld(char c) {
      
        if (c >= 0x0030 && c <= 0x0039) return true;
        if (c >= 0x0660 && c <= 0x0669) return true;
        if (c >= 0x06F0 && c <= 0x06F9) return true;
        if (c >= 0x0966 && c <= 0x096F) return true;
                                       
        if (c >= 0x09E6 && c <= 0x09EF) return true;
        if (c >= 0x0A66 && c <= 0x0A6F) return true;
        if (c >= 0x0AE6 && c <= 0x0AEF) return true;
                                       
        if (c >= 0x0B66 && c <= 0x0B6F) return true;
        if (c >= 0x0BE7 && c <= 0x0BEF) return true;
        if (c >= 0x0C66 && c <= 0x0C6F) return true;
                                       
        if (c >= 0x0CE6 && c <= 0x0CEF) return true;
        if (c >= 0x0D66 && c <= 0x0D6F) return true;
        if (c >= 0x0E50 && c <= 0x0E59) return true;
                                       
        if (c >= 0x0ED0 && c <= 0x0ED9) return true;
        if (c >= 0x0F20 && c <= 0x0F29) return true; 
      
        return false;
      
    }    

    private static boolean isXMLCombiningCharOld(char c) {
        // CombiningChar
        if (c >= 0x0300 && c <= 0x0345) return true;
        if (c >= 0x0360 && c <= 0x0361) return true;
        if (c >= 0x0483 && c <= 0x0486) return true;
        if (c >= 0x0591 && c <= 0x05A1) return true;
                                       
        if (c >= 0x05A3 && c <= 0x05B9) return true;
        if (c >= 0x05BB && c <= 0x05BD) return true;
        if (c == 0x05BF) return true;
        if (c >= 0x05C1 && c <= 0x05C2) return true;
                                       
        if (c == 0x05C4) return true;
        if (c >= 0x064B && c <= 0x0652) return true;
        if (c == 0x0670) return true;
        if (c >= 0x06D6 && c <= 0x06DC) return true;
                                       
        if (c >= 0x06DD && c <= 0x06DF) return true;
        if (c >= 0x06E0 && c <= 0x06E4) return true;
        if (c >= 0x06E7 && c <= 0x06E8) return true;
                                       
        if (c >= 0x06EA && c <= 0x06ED) return true;
        if (c >= 0x0901 && c <= 0x0903) return true;
        if (c == 0x093C) return true;
        if (c >= 0x093E && c <= 0x094C) return true;
                                       
        if (c == 0x094D) return true;
        if (c >= 0x0951 && c <= 0x0954) return true;
        if (c >= 0x0962 && c <= 0x0963) return true;
        if (c >= 0x0981 && c <= 0x0983) return true;
                                       
        if (c == 0x09BC) return true;
        if (c == 0x09BE) return true;
        if (c == 0x09BF) return true;
        if (c >= 0x09C0 && c <= 0x09C4) return true;
        if (c >= 0x09C7 && c <= 0x09C8) return true;
                                       
        if (c >= 0x09CB && c <= 0x09CD) return true;
        if (c == 0x09D7) return true;
        if (c >= 0x09E2 && c <= 0x09E3) return true;
        if (c == 0x0A02) return true;
        if (c == 0x0A3C) return true;
                                       
        if (c == 0x0A3E) return true;
        if (c == 0x0A3F) return true;
        if (c >= 0x0A40 && c <= 0x0A42) return true;
        if (c >= 0x0A47 && c <= 0x0A48) return true;
                                       
        if (c >= 0x0A4B && c <= 0x0A4D) return true;
        if (c >= 0x0A70 && c <= 0x0A71) return true;
        if (c >= 0x0A81 && c <= 0x0A83) return true;
        if (c == 0x0ABC) return true;
                                       
        if (c >= 0x0ABE && c <= 0x0AC5) return true;
        if (c >= 0x0AC7 && c <= 0x0AC9) return true;
        if (c >= 0x0ACB && c <= 0x0ACD) return true;
                                       
        if (c >= 0x0B01 && c <= 0x0B03) return true;
        if (c == 0x0B3C) return true;
        if (c >= 0x0B3E && c <= 0x0B43) return true;
        if (c >= 0x0B47 && c <= 0x0B48) return true;
                                       
        if (c >= 0x0B4B && c <= 0x0B4D) return true;
        if (c >= 0x0B56 && c <= 0x0B57) return true;
        if (c >= 0x0B82 && c <= 0x0B83) return true;
                                       
        if (c >= 0x0BBE && c <= 0x0BC2) return true;
        if (c >= 0x0BC6 && c <= 0x0BC8) return true;
        if (c >= 0x0BCA && c <= 0x0BCD) return true;
        if (c == 0x0BD7) return true;
                                       
        if (c >= 0x0C01 && c <= 0x0C03) return true;
        if (c >= 0x0C3E && c <= 0x0C44) return true;
        if (c >= 0x0C46 && c <= 0x0C48) return true;
                                       
        if (c >= 0x0C4A && c <= 0x0C4D) return true;
        if (c >= 0x0C55 && c <= 0x0C56) return true;
        if (c >= 0x0C82 && c <= 0x0C83) return true;
                                       
        if (c >= 0x0CBE && c <= 0x0CC4) return true;
        if (c >= 0x0CC6 && c <= 0x0CC8) return true;
        if (c >= 0x0CCA && c <= 0x0CCD) return true;
                                       
        if (c >= 0x0CD5 && c <= 0x0CD6) return true;
        if (c >= 0x0D02 && c <= 0x0D03) return true;
        if (c >= 0x0D3E && c <= 0x0D43) return true;
                                       
        if (c >= 0x0D46 && c <= 0x0D48) return true;
        if (c >= 0x0D4A && c <= 0x0D4D) return true;
        if (c == 0x0D57) return true;
        if (c == 0x0E31) return true;
                                       
        if (c >= 0x0E34 && c <= 0x0E3A) return true;
        if (c >= 0x0E47 && c <= 0x0E4E) return true;
        if (c == 0x0EB1) return true;
        if (c >= 0x0EB4 && c <= 0x0EB9) return true;
                                       
        if (c >= 0x0EBB && c <= 0x0EBC) return true;
        if (c >= 0x0EC8 && c <= 0x0ECD) return true;
        if (c >= 0x0F18 && c <= 0x0F19) return true;
        if (c == 0x0F35) return true;
                                       
        if (c == 0x0F37) return true;
        if (c == 0x0F39) return true;
        if (c == 0x0F3E) return true;
        if (c == 0x0F3F) return true;
        if (c >= 0x0F71 && c <= 0x0F84) return true;
                                       
        if (c >= 0x0F86 && c <= 0x0F8B) return true;
        if (c >= 0x0F90 && c <= 0x0F95) return true;
        if (c == 0x0F97) return true;
        if (c >= 0x0F99 && c <= 0x0FAD) return true;
                                       
        if (c >= 0x0FB1 && c <= 0x0FB7) return true;
        if (c == 0x0FB9) return true;
        if (c >= 0x20D0 && c <= 0x20DC) return true;
        if (c == 0x20E1) return true;
                                       
        if (c >= 0x302A && c <= 0x302F) return true;
        if (c == 0x3099) return true;
        if (c == 0x309A) return true; 
        
        return false;
        
    }
    
    private static boolean isXMLExtenderOld(char c) {

        // Extenders                               
        if (c == 0x00B7) return true;
        if (c == 0x02D0) return true;
        if (c == 0x02D1) return true;
        if (c == 0x0387) return true;
        if (c == 0x0640) return true;
        if (c == 0x0E46) return true;
        if (c == 0x0EC6) return true;
        if (c == 0x3005) return true;
                                       
        if (c >= 0x3031 && c <= 0x3035) return true;
        if (c >= 0x309D && c <= 0x309E) return true;
        if (c >= 0x30FC && c <= 0x30FE) return true;
        
        return false;
        
    }
      
    private static boolean isXMLCharacterOld(char c) {
    
        if (c >= 0x20 && c <= 0xD7FF) return true;
        if (c >= 0xE000 && c <= 0xFFFD) return true;
        if (c >= 0x10000 && c <= 0x10FFFF) return true;
        
        if (c == '\n') return true;
        if (c == '\r') return true;
        if (c == '\t') return true;
        
        return false;
    }

    public static void main(String[] args) {
      for (int i = 0; i < (64 * 1024); i++) {
        if (Verifier.isXMLLetter((char)i) !=
            Verifier.isXMLLetterOld((char)i)) {
          System.out.println("isXMLLetter mismatch: " + i + 
                             " hex: " + Integer.toHexString(i));
        }
      }
  
      for (int i = 0; i < (64 * 1024); i++) {
        if (Verifier.isXMLDigit((char)i) !=
            Verifier.isXMLDigitOld((char)i)) {
          System.out.println("isXMLDigit mismatch: " + i + 
                             " hex: " + Integer.toHexString(i));
        }
      }
  
      for (int i = 0; i < (64 * 1024); i++) {
        if (Verifier.isXMLCombiningChar((char)i) !=
            Verifier.isXMLCombiningCharOld((char)i)) {
          System.out.println("isXMLCombiningChar mismatch: " + i + 
                             " hex: " + Integer.toHexString(i));
        }
      }

      for (int i = 0; i < (64 * 1024); i++) {
        if (Verifier.isXMLExtender((char)i) !=
            Verifier.isXMLExtenderOld((char)i)) {
          System.out.println("isXMLExtender mismatch: " + i + 
                             " hex: " + Integer.toHexString(i));
        }
      }

      for (int i = 0; i < (64 * 1024); i++) {
        if (Verifier.isXMLCharacter((char)i) !=
            Verifier.isXMLCharacterOld((char)i)) {
          System.out.println("isXMLCharacter mismatch: " + i + 
                             " hex: " + Integer.toHexString(i));
        }
      }

    }

}