org.w3c package won't compile

Hi, I have a problem and I hope you can help me.

I am trying to use the package org.w3c.dom and tidy

but it will not compile.

I get these 2 types of errors:

org\w3c\tidy\Configuration.java(org\w3c\tidy:Configuration.java):129: as of release 5, 'enum' is a keyword, and may not be used as an identifier
(use -source 1.4 or lower to use 'enum' as an identifier)
String key = (String) enum.nextElement();
^
org\w3c\tidy\DOMNodeImpl.java(org\w3c\tidy:DOMNodeImpl.java):31: org.w3c.tidy.DOMNodeImpl is not abstract and does not override abstract method getUserData(java.lang.String) in org.w3c.dom.Node
public class DOMNodeImpl implements org.w3c.dom.Node {

Pleas
e help ... what is the problem,

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