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
* @see org.eclipse.ui.internal.provisional.views.markers.MarkerItem#getAttributeValue(java.lang.String,
	 *      boolean)
	 */
	public boolean getAttributeValue(String attribute, boolean defaultValue) {
		if (!attributeCache.containsKey(attribute))
			attributeCache.put(attribute, new Boolean(marker.getAttribute(
					attribute, defaultValue)));
		return ((Boolean) attributeCache.get(attribute)).booleanValue();
	}
	/**
	 * Get the value of the attribute in the enclosed marker.
	 * 
	 * @param attribute
	 * @param defaultValue
	 *            the defaultValue if the value is not set
	 * @return int
	 */
	public int getAttributeValue(String attribute, int defaultValue) {
		if (!attributeCache.containsKey(attribute))
			attributeCache.put(attribute, new Integer(marker.getAttribute(
					attribute, defaultValue)));
		return ((Integer) attributeCache.get(attribute)).intValue();
	}
	/**
	 * Get the String value of the attribute in the enclosed marker.
	 * 
	 * @param attribute
	 * @param defaultValue
	 *            the defaultValue if the value is not set
	 * @return String