Bug 120317 Set "dimension" property to 3D in "properties" view, error appears in layout editor.
Description: Set "dimension" property to 3D in "properties" view, error appears in layout editor. Steps to reproduce: 1. Add a 2D chart in property editor. 2. Set its dimension property to "three-dimension" in properties view. 3. Error appears in chart.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ExtensionLoader.java
*/
	void doLoad( ) throws ExtensionException, MetaDataException
	{
		IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry( );
		if ( pluginRegistry == null )
		{
			throw new ExtensionException(
					new String[]{extensionPointer},
					ExtensionException.DESIGN_EXCEPTION_EXTENSION_POINT_NOT_FOUND );
		}
		IExtensionPoint extensionPoint = pluginRegistry
				.getExtensionPoint( extensionPointer );
		if ( extensionPoint == null )
			throw new ExtensionException(
					new String[]{extensionPointer},
					ExtensionException.DESIGN_EXCEPTION_EXTENSION_POINT_NOT_FOUND );
		IExtension[] extensions = extensionPoint.getExtensions( );
		if ( extensions != null )
		{
			for ( int i = 0; i < extensions.length; i++ )
			{
				loadExtension( extensions[i] );
			}
		}
	}
	/**
	 * Represents the loader which loads the top level XML element in extension
	 * definition file. The common constants are defined for parsing.
	 */
	abstract class ExtensionElementLoader