Bug 140160 [Field Assist] - JAVADOC ONLY- FieldDecorationRegistry API should specify that null dec description is allowed
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/FieldDecorationRegistry.java
/**
	 * Decoration id for the decoration that should be used to cue the user that
	 * content proposals are available.
	 */
	public static final String DEC_CONTENT_PROPOSAL = "DEC_CONTENT_PROPOSAL"; 
	/**
	 * Decoration id for the decoration that should be used to cue the user that
	 * a field is required.
	 */
	public static final String DEC_REQUIRED = "DEC_REQUIRED"; 
	/**
	 * Decoration id for the decoration that should be used to cue the user that
	 * a field has an error.
	 */
	public static final String DEC_ERROR = "DEC_ERROR"; 
	/**
	 * Decoration id for the decoration that should be used to cue the user that
	 * a field has a warning.
	 */
	public static final String DEC_WARNING = "DEC_WARNING"; 
	/*
	 * Image id's
	 */
	private static final String IMG_DEC_FIELD_CONTENT_PROPOSAL = "org.eclipse.jface.fieldassist.IMG_DEC_FIELD_CONTENT_PROPOSAL"; 
	private static final String IMG_DEC_FIELD_REQUIRED = "org.eclipse.jface.fieldassist.IMG_DEC_FIELD_REQUIRED";