Bug 95311 [javadoc wizard] Allow setting of -source 1.5 through UI
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javadocexport/JavadocOptionsManager.java
private IContainer[] getSourceContainers(Element element) {
		String sourcePaths= element.getAttribute(SOURCEPATH);
		StringTokenizer tokenizer= new StringTokenizer(sourcePaths, String.valueOf(File.pathSeparatorChar));
		ArrayList res= new ArrayList();
		
		IWorkspaceRoot root= ResourcesPlugin.getWorkspace().getRoot();
		
		while (tokenizer.hasMoreTokens()) {
			IPath path= makeAbsolutePathFromRelative(new Path(tokenizer.nextToken().trim()));
			if (path != null) {
				IContainer[] containers= root.findContainersForLocation(path);
				for (int i= 0; i < containers.length; i++) {
					res.add(containers[i]);
				}
			}
		}
		return (IContainer[]) res.toArray(new IContainer[res.size()]);
	}
	
	private IJavaElement[] getSelectedElementsFromAnt(Element element) {
		List res= new ArrayList();
		
		String packagenames= element.getAttribute(PACKAGENAMES);
		if (packagenames != null) {
			IContainer[] containers= getSourceContainers(element);
			
			StringTokenizer tokenizer= new StringTokenizer(packagenames, ","); 
			while (tokenizer.hasMoreTokens()) {
				IPath relPackagePath= new Path(tokenizer.nextToken().trim().replace('.', '/'));