code: protected String getUriStyleSheet(CmsObject cms, CmsResource res) {
  
          String result = "";
          try {
              String currentTemplate = getUriTemplate(cms, res);
              if (!"".equals(currentTemplate)) {
                  // read the stylesheet from the template file
                  result = cms.readPropertyObject(
                      currentTemplate,
                      CmsPropertyDefinition.PROPERTY_TEMPLATE,
                      false).getValue("");
              }
          } catch (CmsException e) {
              // noop
          }
          return result;
      }
docs: Returns the OpenCms VFS uri of the style sheet of the resource.<p>
  
  @param cms the initialized CmsObject
  @param res the resource where to read the style sheet for
  
  @return the OpenCms VFS uri of the style sheet of resource