Bug 221521 [Markers] New markers API needs to be pared down
We have too much API in some of the new classes and they can be moved to internals
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
private String[] getMarkerTypes(IConfigurationElement element) {
		IConfigurationElement[] types = element
				.getChildren(MARKER_TYPE_REFERENCE);
		String[] ids = new String[types.length];
		for (int i = 0; i < ids.length; i++) {
			ids[i] = types[i].getAttribute(MarkerSupportConstants.ATTRIBUTE_ID);
		}
		return ids;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler#addExtension(org.eclipse.core.runtime.dynamichelpers.IExtensionTracker,
	 *      org.eclipse.core.runtime.IExtension)
	 */
	public void addExtension(IExtensionTracker tracker, IExtension extension) {
		Map groupIDsToEntries = new HashMap();
		Map entryIDsToEntries = new HashMap();
		Map generatorExtensions = new HashMap();
		Set attributeMappings = new HashSet();
		processExtension(tracker, extension, groupIDsToEntries,
				entryIDsToEntries, attributeMappings, generatorExtensions);
		postProcessExtensions(groupIDsToEntries, entryIDsToEntries,
				attributeMappings, generatorExtensions);
	}
	/**
	 * Get the collection of currently registered filters.
	 * 
	 * @return Collection of ProblemFilter
	 */