code: def normalize_docroot(app, root):
      
  
      srcdir = app.env.srcdir
      default_version = app.config.javalink_default_version
  
      if isinstance(root, basestring):
          (url, base) = _parse_docroot_str(srcdir, root)
          return {'root': url, 'base': base, 'version': default_version}
      else:
          normalized = {}
          normalized['root'] = _parse_docroot_str(srcdir, root['root'])[0]
  
          if 'base' in root:
              normalized['base'] = _parse_docroot_str(srcdir, root['base'])[1]
          else:
              normalized['base'] = _parse_docroot_str(srcdir, root['root'])[1]
  
          if 'version' in root:
              normalized['version'] = root['version']
          else:
              normalized['version'] = default_version
  
          return normalized
docs: Creates a package-list URL and a link base from a docroot element.
  
      Args:
          app: the global app object
          root: the docroot element [string or dictionary]