docs: private Set<String> getSchemaHeadIncludes(CmsObject cms, CmsResource res, String type) throws CmsLoaderException {
  
          if (type.equals(TYPE_CSS)) {
              return getCSSHeadIncludes(cms, res);
          } else if (type.equals(TYPE_JAVASCRIPT)) {
              return getJSHeadIncludes(cms, res);
          }
          return null;
      }