added time_rule parameter

rook/processes/wps_subset.py

@@ -30,8 +30,19 @@ def __init__(self):
             LiteralInput(
                 "time",
                 "Time Period",
-                abstract="The time period to subset over separated by /"
-                "Example: 1860-01-01/1900-12-30",
+                abstract="The time interval (start/end) to subset over separated by '/'"
+                " or a list of time points separated by ','."
+                " The format is according to the ISO-8601 standard."
+                " Example: 1860-01-01/1900-12-30 or 1860-01-01, 1870-01-01, 1880-01-01",
+                data_type="string",
+                min_occurs=0,
+                max_occurs=1,
+            ),
+            LiteralInput(
+                "time_rule",
+                "Time Rule",
+                abstract="An optional time rule to describe divisions of the time period (like seasons)."
+                " Example: months:01,02,03 or years:1970,1980|months=01|days:01",
                 data_type="string",
                 min_occurs=0,
                 max_occurs=1,
@@ -131,6 +142,8 @@ def _handler(self, request, response):
         # show me the environment used by the process in debug mode
         LOGGER.debug(f"Environment used in subset: {os.environ}")
 
+        LOGGER.info(f"time rule: {request.inputs['time_rule'][0].data}")
+
         # from roocs_utils.exceptions import InvalidParameterValue, MissingParameterValue
         collection = parse_wps_input(
             request.inputs, "collection", as_sequence=True, must_exist=True