Bug 108493 [Markers] Show tooltips for table columns in marker views
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/api/MarkerField.java
}
	/**
	 * Return the id for the receiver.
	 * 
	 * @return String
	 */
	public String getId() {
		return configurationElement
				.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID);
	}
	/**
	 * Return the image for the receiver. By default return <code>null</code>.
	 * 
	 * @param item
	 * @return The image value of the object for this particular field to be
	 *         displayed to the user or <code>null<code>.
	 */
	public Image getImage(MarkerItem item) {
		return null;
	}
	/**
	 * Return the value for a marker.
	 * 
	 * @param marker
	 * @return String
	 */
	public String getMarkerValue(IMarker marker) {
		return getValue(new MarkerEntry(marker));
	}
	/**