create datasets.xml from collection of dataset.xml files

datasets.xml

@@ -875,7 +875,7 @@ [email protected], *@example.com</subscriptionEmailBlacklist>
         <att name="creator_type">institution</att>
         <att name="infoUrl">imars.usf.edu</att>
         <att name="institution">USF IMaRS</att>
-        <att name="keywords">chlor_a, chlor_a_anom, chlor_a_median, chlorophyll, color, concentration, concentration_of_chlorophyll_in_sea_water, data, earth, Earth Science &gt; Oceans &gt; Ocean Chemistry &gt; Chlorophyll, florida, img, img_x, img_y, local, median, ocean, ocean color, oceans, optical, optical properties, properties, rrs, Rrs_671_anom, Rrs_671_median, science, sea, seawater, source, south, university, usf, water</att>
+        <att name="keywords">chlor_a_anomaly, chlor_a_median, chlorophyll, concentration_of_chlorophyll_in_sea_water, ocean_color</att>
         <att name="keywords_vocabulary">GCMD Science Keywords</att>
         <att name="Lat-Lon_Limits">null</att>
         <att name="Lat_Lon_Limits">24.0N to 28N -85W to -78.5W</att>