availability

See also https://github.com/hapi-server/data-specification/wiki/file-listings

Recommended dataset naming is to end it with "DATASET/filelist", e.g., "MyDataset/filelist" (not "filelist/MyDataset"), and also add "x_parameterSchema="filelist" in the info response.

We start with a base class which is just a "Listing of Times":

• time isotime

"Availability" required elements:

• startDate - start date/time of coverage (isotime, required)
• stopDate - (isotime) stop date/time of coverage; exclusive (like HAPI request end times)

Optional and recommended elements:

• numberValidRecords (int) count of the records in the interval where there is at least one non-FILL value in the record; this is easy an unambiguous to compute on the server side; the interpretation by clients is harder, esp. for non-uniform cadence (clients want to know - is this interval good or not)

For future discussion

• numberOfRecords (int) - the number of records (valid data or FILL values) that are present within the startDate and stopDate
• estimatedFractionOfIntervalFilledWithValidRecords - easy to use for clients, but hard to know how to uniformly implement on servers
• version (str)
• PARAMETER_NAME/numberValidRecords ???