Bug 205049 Other plug-ins should be able to define default content generator
Currently only the content generator can define which plug-ins it can be the default for - we need a way for plug-ins to refer back to the marker support for thier own generator.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/api/MarkerField.java
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.provisional.views.markers.MarkerEntry;
import org.eclipse.ui.internal.util.BundleUtility;
import org.eclipse.ui.statushandlers.StatusManager;
/**
 * MarkerField is the abstract superclass of the definition of the content
 * providers for columns in a Markers View.
 * 
 * @since 3.4
 * 
 */
public abstract class MarkerField {
	
	private static final String ATTRIBUTE_FILTER_CLASS = "filterClass"; 
	private static final String ATTRIBUTE_FILTER_CONFIGURATION_CLASS = "filterConfigurationClass"; 
	
	IConfigurationElement configurationElement;
	/**
	 * Compare item1 and item2 for sorting purposes.
	 * 
	 * @param item1
	 * @param item2
	 * @return Either: