code: public static CmsExtractionResult extractXmlContent(CmsObject cms, CmsResource resource, I_CmsSearchIndex index)
      throws CmsException {
  
          return extractXmlContent(cms, resource, index, null);
      }
docs: Extracts the content of a single XML content resource.<p>
  
  @param cms the cms context
  @param resource the resource
  @param index the used index
  
  @return the extraction result
  
  @throws CmsException in case reading or unmarshalling the content fails