anchor.diff:  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>
  + <featureCollection ... >
  +   ...
  +   <filesSort increasing = "false" />
  + </featureCollection>
   
   == Static vs. changing datasets
   
  
positive.code: You might also need to put the SimpleDateFormat before the substring match, eg in the following, _stuff_ differs for each subdirectory, so you can't
  match on it:
  
   _/dataroot/stuff/20111226/Experiment-02387347.grib1_
  
  However, you can match on _Experiment_ so you can use:
  
  
negative.code: 
  === tdm element (GRIB only)
  
  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 * * * ? *"  />
  