Bug 208098 [Markers] All content provider needs a type field
As All shows everything the type column would be very useful for filtering.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerEntry.java
public String getDescription() {
		return getAttributeValue(IMarker.MESSAGE, MarkerSupportConstants.EMPTY_STRING);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.provisional.views.markers.MarkerItem#getID()
	 */
	public long getID() {
		return marker.getId();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.provisional.views.markers.MarkerItem#getLocation()
	 */
	public String getLocation() {
		if (attributeCache.containsKey(IMarker.LOCATION))
			return (String) attributeCache.get(IMarker.LOCATION);
		try {
			if (marker.getAttribute(IMarker.LOCATION) != null) {
				String value = marker.getAttribute(IMarker.LOCATION,
						MarkerSupportConstants.EMPTY_STRING);
				attributeCache.put(IMarker.LOCATION, marker
						.getAttribute(IMarker.LOCATION));
				return value;
			}
		} catch (CoreException e) {
			StatusManager.getManager().handle(e.getStatus());
		}