anchor.diff:  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_
  + /dataroot/stuff/20111226/Experiment-02387347.grib1
   
   However, you can match on _Experiment_ so you can use:
   
  
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
  
  