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	/*
	* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package javax.swing.text.html;

	import java.io.*;
	import java.util.Hashtable;
	import javax.swing.text.AttributeSet;
	import javax.swing.text.StyleConstants;
	import javax.swing.text.StyleContext;

	/**
	* Constants used in the <code>HTMLDocument</code>. These
	* are basically tag and attribute definitions.
	*
	* @author Timothy Prinzing
	* @author Sunita Mani
	*
	*/
	public class HTML {

	/**
	* Typesafe enumeration for an HTML tag. Although the
	* set of HTML tags is a closed set, we have left the
	* set open so that people can add their own tag types
	* to their custom parser and still communicate to the
	* reader.
	*/
	public static class Tag {

	/** @since 1.3 */
	public Tag() {}

	/**
	* Creates a new <code>Tag</code> with the specified <code>id</code>,
	* and with <code>causesBreak</code> and <code>isBlock</code>
	* set to <code>false</code>.
	*
	* @param id the id of the new tag
	*/
	protected Tag(String id) {
	this(id, false, false);
	}

	/**
	* Creates a new <code>Tag</code> with the specified <code>id</code>;
	* <code>causesBreak</code> and <code>isBlock</code> are defined
	* by the user.
	*
	* @param id the id of the new tag
	* @param causesBreak <code>true</code> if this tag
	* causes a break to the flow of data
	* @param isBlock <code>true</code> if the tag is used
	* to add structure to a document
	*/
	protected Tag(String id, boolean causesBreak, boolean isBlock) {
	name = id;
	this.breakTag = causesBreak;
	this.blockTag = isBlock;
	}

	/**
	* Returns <code>true</code> if this tag is a block
	* tag, which is a tag used to add structure to a
	* document.
	*
	* @return <code>true</code> if this tag is a block
	* tag, otherwise returns <code>false</code>
	*/
	public boolean isBlock() {
	return blockTag;
	}

	/**
	* Returns <code>true</code> if this tag causes a
	* line break to the flow of data, otherwise returns
	* <code>false</code>.
	*
	* @return <code>true</code> if this tag causes a
	* line break to the flow of data, otherwise returns
	* <code>false</code>
	*/
	public boolean breaksFlow() {
	return breakTag;
	}

	/**
	* Returns <code>true</code> if this tag is pre-formatted,
	* which is true if the tag is either <code>PRE</code> or
	* <code>TEXTAREA</code>.
	*
	* @return <code>true</code> if this tag is pre-formatted,
	* otherwise returns <code>false</code>
	*/
	public boolean isPreformatted() {
	return (this == PRE \|\| this == TEXTAREA);
	}

	/**
	* Returns the string representation of the
	* tag.
	*
	* @return the <code>String</code> representation of the tag
	*/
	public String toString() {
	return name;
	}

	/**
	* Returns <code>true</code> if this tag is considered to be a paragraph
	* in the internal HTML model. <code>false</code> - otherwise.
	*
	* @return <code>true</code> if this tag is considered to be a paragraph
	* in the internal HTML model. <code>false</code> - otherwise.
	* @see HTMLDocument.HTMLReader.ParagraphAction
	*/
	boolean isParagraph() {
	return (
	this == P
	\|\| this == IMPLIED
	\|\| this == DT
	\|\| this == H1
	\|\| this == H2
	\|\| this == H3
	\|\| this == H4
	\|\| this == H5
	\|\| this == H6
	);
	}

	boolean blockTag;
	boolean breakTag;
	String name;
	boolean unknown;

	// --- Tag Names -----------------------------------

	public static final Tag A = new Tag("a");
	public static final Tag ADDRESS = new Tag("address");
	public static final Tag APPLET = new Tag("applet");
	public static final Tag AREA = new Tag("area");
	public static final Tag B = new Tag("b");
	public static final Tag BASE = new Tag("base");
	public static final Tag BASEFONT = new Tag("basefont");
	public static final Tag BIG = new Tag("big");
	public static final Tag BLOCKQUOTE = new Tag("blockquote", true, true);
	public static final Tag BODY = new Tag("body", true, true);
	public static final Tag BR = new Tag("br", true, false);
	public static final Tag CAPTION = new Tag("caption");
	public static final Tag CENTER = new Tag("center", true, false);
	public static final Tag CITE = new Tag("cite");
	public static final Tag CODE = new Tag("code");
	public static final Tag DD = new Tag("dd", true, true);
	public static final Tag DFN = new Tag("dfn");
	public static final Tag DIR = new Tag("dir", true, true);
	public static final Tag DIV = new Tag("div", true, true);
	public static final Tag DL = new Tag("dl", true, true);
	public static final Tag DT = new Tag("dt", true, true);
	public static final Tag EM = new Tag("em");
	public static final Tag FONT = new Tag("font");
	public static final Tag FORM = new Tag("form", true, false);
	public static final Tag FRAME = new Tag("frame");
	public static final Tag FRAMESET = new Tag("frameset");
	public static final Tag H1 = new Tag("h1", true, true);
	public static final Tag H2 = new Tag("h2", true, true);
	public static final Tag H3 = new Tag("h3", true, true);
	public static final Tag H4 = new Tag("h4", true, true);
	public static final Tag H5 = new Tag("h5", true, true);
	public static final Tag H6 = new Tag("h6", true, true);
	public static final Tag HEAD = new Tag("head", true, true);
	public static final Tag HR = new Tag("hr", true, false);
	public static final Tag HTML = new Tag("html", true, false);
	public static final Tag I = new Tag("i");
	public static final Tag IMG = new Tag("img");
	public static final Tag INPUT = new Tag("input");
	public static final Tag ISINDEX = new Tag("isindex", true, false);
	public static final Tag KBD = new Tag("kbd");
	public static final Tag LI = new Tag("li", true, true);
	public static final Tag LINK = new Tag("link");
	public static final Tag MAP = new Tag("map");
	public static final Tag MENU = new Tag("menu", true, true);
	public static final Tag META = new Tag("meta");
	/public/ static final Tag NOBR = new Tag("nobr");
	public static final Tag NOFRAMES = new Tag("noframes", true, true);
	public static final Tag OBJECT = new Tag("object");
	public static final Tag OL = new Tag("ol", true, true);
	public static final Tag OPTION = new Tag("option");
	public static final Tag P = new Tag("p", true, true);
	public static final Tag PARAM = new Tag("param");
	public static final Tag PRE = new Tag("pre", true, true);
	public static final Tag SAMP = new Tag("samp");
	public static final Tag SCRIPT = new Tag("script");
	public static final Tag SELECT = new Tag("select");
	public static final Tag SMALL = new Tag("small");
	public static final Tag SPAN = new Tag("span");
	public static final Tag STRIKE = new Tag("strike");
	public static final Tag S = new Tag("s");
	public static final Tag STRONG = new Tag("strong");
	public static final Tag STYLE = new Tag("style");
	public static final Tag SUB = new Tag("sub");
	public static final Tag SUP = new Tag("sup");
	public static final Tag TABLE = new Tag("table", false, true);
	public static final Tag TD = new Tag("td", true, true);
	public static final Tag TEXTAREA = new Tag("textarea");
	public static final Tag TH = new Tag("th", true, true);
	public static final Tag TITLE = new Tag("title", true, true);
	public static final Tag TR = new Tag("tr", false, true);
	public static final Tag TT = new Tag("tt");
	public static final Tag U = new Tag("u");
	public static final Tag UL = new Tag("ul", true, true);
	public static final Tag VAR = new Tag("var");

	/**
	* All text content must be in a paragraph element.
	* If a paragraph didn't exist when content was
	* encountered, a paragraph is manufactured.
	* <p>
	* This is a tag synthesized by the HTML reader.
	* Since elements are identified by their tag type,
	* we create a some fake tag types to mark the elements
	* that were manufactured.
	*/
	public static final Tag IMPLIED = new Tag("p-implied");

	/**
	* All text content is labeled with this tag.
	* <p>
	* This is a tag synthesized by the HTML reader.
	* Since elements are identified by their tag type,
	* we create a some fake tag types to mark the elements
	* that were manufactured.
	*/
	public static final Tag CONTENT = new Tag("content");

	/**
	* All comments are labeled with this tag.
	* <p>
	* This is a tag synthesized by the HTML reader.
	* Since elements are identified by their tag type,
	* we create a some fake tag types to mark the elements
	* that were manufactured.
	*/
	public static final Tag COMMENT = new Tag("comment");

	static final Tag allTags[] = {
	A, ADDRESS, APPLET, AREA, B, BASE, BASEFONT, BIG,
	BLOCKQUOTE, BODY, BR, CAPTION, CENTER, CITE, CODE,
	DD, DFN, DIR, DIV, DL, DT, EM, FONT, FORM, FRAME,
	FRAMESET, H1, H2, H3, H4, H5, H6, HEAD, HR, HTML,
	I, IMG, INPUT, ISINDEX, KBD, LI, LINK, MAP, MENU,
	META, NOBR, NOFRAMES, OBJECT, OL, OPTION, P, PARAM,
	PRE, SAMP, SCRIPT, SELECT, SMALL, SPAN, STRIKE, S,
	STRONG, STYLE, SUB, SUP, TABLE, TD, TEXTAREA,
	TH, TITLE, TR, TT, U, UL, VAR
	};

	static {
	// Force HTMLs static initialize to be loaded.
	getTag("html");
	}
	}

	// There is no unique instance of UnknownTag, so we allow it to be
	// Serializable.
	public static class UnknownTag extends Tag implements Serializable {

	/**
	* Creates a new <code>UnknownTag</code> with the specified
	* <code>id</code>.
	* @param id the id of the new tag
	*/
	public UnknownTag(String id) {
	super(id);
	}

	/**
	* Returns the hash code which corresponds to the string
	* for this tag.
	*/
	public int hashCode() {
	return toString().hashCode();
	}

	/**
	* Compares this object to the specified object.
	* The result is <code>true</code> if and only if the argument is not
	* <code>null</code> and is an <code>UnknownTag</code> object
	* with the same name.
	*
	* @param obj the object to compare this tag with
	* @return <code>true</code> if the objects are equal;
	* <code>false</code> otherwise
	*/
	public boolean equals(Object obj) {
	if (obj instanceof UnknownTag) {
	return toString().equals(obj.toString());
	}
	return false;
	}

	private void writeObject(java.io.ObjectOutputStream s)
	throws IOException {
	s.defaultWriteObject();
	s.writeBoolean(blockTag);
	s.writeBoolean(breakTag);
	s.writeBoolean(unknown);
	s.writeObject(name);
	}

	private void readObject(ObjectInputStream s)
	throws ClassNotFoundException, IOException {
	s.defaultReadObject();
	blockTag = s.readBoolean();
	breakTag = s.readBoolean();
	unknown = s.readBoolean();
	name = (String)s.readObject();
	}
	}

	/**
	* Typesafe enumeration representing an HTML
	* attribute.
	*/
	public static final class Attribute {

	/**
	* Creates a new <code>Attribute</code> with the specified
	* <code>id</code>.
	*
	* @param id the id of the new <code>Attribute</code>
	*/
	Attribute(String id) {
	name = id;
	}

	/**
	* Returns the string representation of this attribute.
	* @return the string representation of this attribute
	*/
	public String toString() {
	return name;
	}

	private String name;

	public static final Attribute SIZE = new Attribute("size");
	public static final Attribute COLOR = new Attribute("color");
	public static final Attribute CLEAR = new Attribute("clear");
	public static final Attribute BACKGROUND = new Attribute("background");
	public static final Attribute BGCOLOR = new Attribute("bgcolor");
	public static final Attribute TEXT = new Attribute("text");
	public static final Attribute LINK = new Attribute("link");
	public static final Attribute VLINK = new Attribute("vlink");
	public static final Attribute ALINK = new Attribute("alink");
	public static final Attribute WIDTH = new Attribute("width");
	public static final Attribute HEIGHT = new Attribute("height");
	public static final Attribute ALIGN = new Attribute("align");
	public static final Attribute NAME = new Attribute("name");
	public static final Attribute HREF = new Attribute("href");
	public static final Attribute REL = new Attribute("rel");
	public static final Attribute REV = new Attribute("rev");
	public static final Attribute TITLE = new Attribute("title");
	public static final Attribute TARGET = new Attribute("target");
	public static final Attribute SHAPE = new Attribute("shape");
	public static final Attribute COORDS = new Attribute("coords");
	public static final Attribute ISMAP = new Attribute("ismap");
	public static final Attribute NOHREF = new Attribute("nohref");
	public static final Attribute ALT = new Attribute("alt");
	public static final Attribute ID = new Attribute("id");
	public static final Attribute SRC = new Attribute("src");
	public static final Attribute HSPACE = new Attribute("hspace");
	public static final Attribute VSPACE = new Attribute("vspace");
	public static final Attribute USEMAP = new Attribute("usemap");
	public static final Attribute LOWSRC = new Attribute("lowsrc");
	public static final Attribute CODEBASE = new Attribute("codebase");
	public static final Attribute CODE = new Attribute("code");
	public static final Attribute ARCHIVE = new Attribute("archive");
	public static final Attribute VALUE = new Attribute("value");
	public static final Attribute VALUETYPE = new Attribute("valuetype");
	public static final Attribute TYPE = new Attribute("type");
	public static final Attribute CLASS = new Attribute("class");
	public static final Attribute STYLE = new Attribute("style");
	public static final Attribute LANG = new Attribute("lang");
	public static final Attribute FACE = new Attribute("face");
	public static final Attribute DIR = new Attribute("dir");
	public static final Attribute DECLARE = new Attribute("declare");
	public static final Attribute CLASSID = new Attribute("classid");
	public static final Attribute DATA = new Attribute("data");
	public static final Attribute CODETYPE = new Attribute("codetype");
	public static final Attribute STANDBY = new Attribute("standby");
	public static final Attribute BORDER = new Attribute("border");
	public static final Attribute SHAPES = new Attribute("shapes");
	public static final Attribute NOSHADE = new Attribute("noshade");
	public static final Attribute COMPACT = new Attribute("compact");
	public static final Attribute START = new Attribute("start");
	public static final Attribute ACTION = new Attribute("action");
	public static final Attribute METHOD = new Attribute("method");
	public static final Attribute ENCTYPE = new Attribute("enctype");
	public static final Attribute CHECKED = new Attribute("checked");
	public static final Attribute MAXLENGTH = new Attribute("maxlength");
	public static final Attribute MULTIPLE = new Attribute("multiple");
	public static final Attribute SELECTED = new Attribute("selected");
	public static final Attribute ROWS = new Attribute("rows");
	public static final Attribute COLS = new Attribute("cols");
	public static final Attribute DUMMY = new Attribute("dummy");
	public static final Attribute CELLSPACING = new Attribute("cellspacing");
	public static final Attribute CELLPADDING = new Attribute("cellpadding");
	public static final Attribute VALIGN = new Attribute("valign");
	public static final Attribute HALIGN = new Attribute("halign");
	public static final Attribute NOWRAP = new Attribute("nowrap");
	public static final Attribute ROWSPAN = new Attribute("rowspan");
	public static final Attribute COLSPAN = new Attribute("colspan");
	public static final Attribute PROMPT = new Attribute("prompt");
	public static final Attribute HTTPEQUIV = new Attribute("http-equiv");
	public static final Attribute CONTENT = new Attribute("content");
	public static final Attribute LANGUAGE = new Attribute("language");
	public static final Attribute VERSION = new Attribute("version");
	public static final Attribute N = new Attribute("n");
	public static final Attribute FRAMEBORDER = new Attribute("frameborder");
	public static final Attribute MARGINWIDTH = new Attribute("marginwidth");
	public static final Attribute MARGINHEIGHT = new Attribute("marginheight");
	public static final Attribute SCROLLING = new Attribute("scrolling");
	public static final Attribute NORESIZE = new Attribute("noresize");
	public static final Attribute ENDTAG = new Attribute("endtag");
	public static final Attribute COMMENT = new Attribute("comment");
	static final Attribute MEDIA = new Attribute("media");

	static final Attribute allAttributes[] = {
	FACE,
	COMMENT,
	SIZE,
	COLOR,
	CLEAR,
	BACKGROUND,
	BGCOLOR,
	TEXT,
	LINK,
	VLINK,
	ALINK,
	WIDTH,
	HEIGHT,
	ALIGN,
	NAME,
	HREF,
	REL,
	REV,
	TITLE,
	TARGET,
	SHAPE,
	COORDS,
	ISMAP,
	NOHREF,
	ALT,
	ID,
	SRC,
	HSPACE,
	VSPACE,
	USEMAP,
	LOWSRC,
	CODEBASE,
	CODE,
	ARCHIVE,
	VALUE,
	VALUETYPE,
	TYPE,
	CLASS,
	STYLE,
	LANG,
	DIR,
	DECLARE,
	CLASSID,
	DATA,
	CODETYPE,
	STANDBY,
	BORDER,
	SHAPES,
	NOSHADE,
	COMPACT,
	START,
	ACTION,
	METHOD,
	ENCTYPE,
	CHECKED,
	MAXLENGTH,
	MULTIPLE,
	SELECTED,
	ROWS,
	COLS,
	DUMMY,
	CELLSPACING,
	CELLPADDING,
	VALIGN,
	HALIGN,
	NOWRAP,
	ROWSPAN,
	COLSPAN,
	PROMPT,
	HTTPEQUIV,
	CONTENT,
	LANGUAGE,
	VERSION,
	N,
	FRAMEBORDER,
	MARGINWIDTH,
	MARGINHEIGHT,
	SCROLLING,
	NORESIZE,
	MEDIA,
	ENDTAG
	};
	}

	// The secret to 73, is that, given that the Hashtable contents
	// never change once the static initialization happens, the initial size
	// that the hashtable grew to was determined, and then that very size
	// is used.
	//
	private static final Hashtable<String, Tag> tagHashtable = new Hashtable<String, Tag>(73);

	/** Maps from StyleConstant key to HTML.Tag. */
	private static final Hashtable<Object, Tag> scMapping = new Hashtable<Object, Tag>(8);

	static {

	for (int i = 0; i < Tag.allTags.length; i++ ) {
	tagHashtable.put(Tag.allTags[i].toString(), Tag.allTags[i]);
	StyleContext.registerStaticAttributeKey(Tag.allTags[i]);
	}
	StyleContext.registerStaticAttributeKey(Tag.IMPLIED);
	StyleContext.registerStaticAttributeKey(Tag.CONTENT);
	StyleContext.registerStaticAttributeKey(Tag.COMMENT);
	for (int i = 0; i < Attribute.allAttributes.length; i++) {
	StyleContext.registerStaticAttributeKey(Attribute.
	allAttributes[i]);
	}
	StyleContext.registerStaticAttributeKey(HTML.NULL_ATTRIBUTE_VALUE);
	scMapping.put(StyleConstants.Bold, Tag.B);
	scMapping.put(StyleConstants.Italic, Tag.I);
	scMapping.put(StyleConstants.Underline, Tag.U);
	scMapping.put(StyleConstants.StrikeThrough, Tag.STRIKE);
	scMapping.put(StyleConstants.Superscript, Tag.SUP);
	scMapping.put(StyleConstants.Subscript, Tag.SUB);
	scMapping.put(StyleConstants.FontFamily, Tag.FONT);
	scMapping.put(StyleConstants.FontSize, Tag.FONT);
	}

	/**
	* Returns the set of actual HTML tags that
	* are recognized by the default HTML reader.
	* This set does not include tags that are
	* manufactured by the reader.
	*/
	public static Tag[] getAllTags() {
	Tag[] tags = new Tag[Tag.allTags.length];
	System.arraycopy(Tag.allTags, 0, tags, 0, Tag.allTags.length);
	return tags;
	}

	/**
	* Fetches a tag constant for a well-known tag name (i.e. one of
	* the tags in the set {A, ADDRESS, APPLET, AREA, B,
	* BASE, BASEFONT, BIG,
	* BLOCKQUOTE, BODY, BR, CAPTION, CENTER, CITE, CODE,
	* DD, DFN, DIR, DIV, DL, DT, EM, FONT, FORM, FRAME,
	* FRAMESET, H1, H2, H3, H4, H5, H6, HEAD, HR, HTML,
	* I, IMG, INPUT, ISINDEX, KBD, LI, LINK, MAP, MENU,
	* META, NOBR, NOFRAMES, OBJECT, OL, OPTION, P, PARAM,
	* PRE, SAMP, SCRIPT, SELECT, SMALL, SPAN, STRIKE, S,
	* STRONG, STYLE, SUB, SUP, TABLE, TD, TEXTAREA,
	* TH, TITLE, TR, TT, U, UL, VAR}. If the given
	* name does not represent one of the well-known tags, then
	* <code>null</code> will be returned.
	*
	* @param tagName the <code>String</code> name requested
	* @return a tag constant corresponding to the <code>tagName</code>,
	* or <code>null</code> if not found
	*/
	public static Tag getTag(String tagName) {

	Tag t = tagHashtable.get(tagName);
	return (t == null ? null : t);
	}

	/**
	* Returns the HTML <code>Tag</code> associated with the
	* <code>StyleConstants</code> key <code>sc</code>.
	* If no matching <code>Tag</code> is found, returns
	* <code>null</code>.
	*
	* @param sc the <code>StyleConstants</code> key
	* @return tag which corresponds to <code>sc</code>, or
	* <code>null</code> if not found
	*/
	static Tag getTagForStyleConstantsKey(StyleConstants sc) {
	return scMapping.get(sc);
	}

	/**
	* Fetches an integer attribute value. Attribute values
	* are stored as a string, and this is a convenience method
	* to convert to an actual integer.
	*
	* @param attr the set of attributes to use to try to fetch a value
	* @param key the key to use to fetch the value
	* @param def the default value to use if the attribute isn't
	* defined or there is an error converting to an integer
	*/
	public static int getIntegerAttributeValue(AttributeSet attr,
	Attribute key, int def) {
	int value = def;
	String istr = (String) attr.getAttribute(key);
	if (istr != null) {
	try {
	value = Integer.valueOf(istr).intValue();
	} catch (NumberFormatException e) {
	value = def;
	}
	}
	return value;
	}

	// This is used in cases where the value for the attribute has not
	// been specified.
	//
	public static final String NULL_ATTRIBUTE_VALUE = "#DEFAULT";

	// size determined similar to size of tagHashtable
	private static final Hashtable<String, Attribute> attHashtable = new Hashtable<String, Attribute>(77);

	static {

	for (int i = 0; i < Attribute.allAttributes.length; i++ ) {
	attHashtable.put(Attribute.allAttributes[i].toString(), Attribute.allAttributes[i]);
	}
	}

	/**
	* Returns the set of HTML attributes recognized.
	* @return the set of HTML attributes recognized
	*/
	public static Attribute[] getAllAttributeKeys() {
	Attribute[] attributes = new Attribute[Attribute.allAttributes.length];
	System.arraycopy(Attribute.allAttributes, 0,
	attributes, 0, Attribute.allAttributes.length);
	return attributes;
	}

	/**
	* Fetches an attribute constant for a well-known attribute name
	* (i.e. one of the attributes in the set {FACE, COMMENT, SIZE,
	* COLOR, CLEAR, BACKGROUND, BGCOLOR, TEXT, LINK, VLINK, ALINK,
	* WIDTH, HEIGHT, ALIGN, NAME, HREF, REL, REV, TITLE, TARGET,
	* SHAPE, COORDS, ISMAP, NOHREF, ALT, ID, SRC, HSPACE, VSPACE,
	* USEMAP, LOWSRC, CODEBASE, CODE, ARCHIVE, VALUE, VALUETYPE,
	* TYPE, CLASS, STYLE, LANG, DIR, DECLARE, CLASSID, DATA, CODETYPE,
	* STANDBY, BORDER, SHAPES, NOSHADE, COMPACT, START, ACTION, METHOD,
	* ENCTYPE, CHECKED, MAXLENGTH, MULTIPLE, SELECTED, ROWS, COLS,
	* DUMMY, CELLSPACING, CELLPADDING, VALIGN, HALIGN, NOWRAP, ROWSPAN,
	* COLSPAN, PROMPT, HTTPEQUIV, CONTENT, LANGUAGE, VERSION, N,
	* FRAMEBORDER, MARGINWIDTH, MARGINHEIGHT, SCROLLING, NORESIZE,
	* MEDIA, ENDTAG}).
	* If the given name does not represent one of the well-known attributes,
	* then <code>null</code> will be returned.
	*
	* @param attName the <code>String</code> requested
	* @return the <code>Attribute</code> corresponding to <code>attName</code>
	*/
	public static Attribute getAttributeKey(String attName) {
	Attribute a = attHashtable.get(attName);
	if (a == null) {
	return null;
	}
	return a;
	}

	}

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