code: protected String getTreeToken(
          CmsObject cms,
          A_CmsXmlContentValue value,
          CmsResource resource,
          Locale contentLocale) {
  
          return cms.getRequestContext().getSiteRoot();
      }
docs: Computes the tree token, which is used to decide which preloaded tree, if any, to load for the VFS/sitemap tabs.<p>
  
  @param cms the current CMS context
  @param value the content value
  @param resource the content resource
  @param contentLocale the content locale
  
  @return the tree token