anchor.diff:  
   === tdm element (GRIB only)
   
  -You must use the *tdm* element for GRIB collections that change. The link:TDM.html[TDM] is a seperate process that uses the same configuration
  +You must use the *tdm* element for GRIB collections that change. The link:TDM.html[TDM] is a separate process that uses the same configuration
   catalogs as the TDS, and updates GRIB collections in the background. Example:
   
    <tdm rewrite="test" rescan="0 4,19,34,49 * * * ? *"  />
  
positive.code: 
  When the date is in the directory name and not completely in the filename, you must use the **dateFormatMark**. For example with a file path
  
   _/data/ldm/pub/native/grid/NCEP/GFS/Alaska_191km/20111226/Run_1200.grib1_
  
  use
  
  
negative.code: When a collection shows a list of files, the files will be sorted by increasing name. To use a decreasing sort, use the fileSort inside the
  featureCollection element:
  
   <featureCollection ... >
     ...
     <filesSort increasing = "false" />
   </featureCollection>
  
  == Static vs. changing datasets
  
  