Bug 119331 Library - name space terminology and behavior
During BIRT 2.0 library feature review meeting the following change was decided. - Change the term namespace to 'prefix' - By default use the library name as the prefix ( namespace ); the dialog to input prefix should be prompted only if hte auto generated prefix is not unique.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
*/
	public static boolean containElement( AbstractTreeViewer treeViewer,
			Object element )
	{
		ITreeContentProvider provider = (ITreeContentProvider) treeViewer.getContentProvider( );
		Object input = treeViewer.getInput( );
		if ( input instanceof Object[] )
		{
			Object[] inputs = (Object[]) input;
			for ( int i = 0; i < inputs.length; i++ )
			{
				if ( containElement( inputs[i], provider, element ) )
				{
					return true;
				}
			}
			return false;
		}
		return containElement( input, provider, element );
	}
	private static boolean containElement( Object parent,
			ITreeContentProvider provider, Object element )
	{
		if ( parent == null )
		{
			return false;
		}
		if ( parent == element || parent.equals( element ) )
		{
			return true;