Consideration of properties.datetime in duplicate checking

[josusky]

I am not sure if this is the right place to mention the issue, but it was raised during testing so let's start here. The current test for Global Cache expects that a a notification with the same pubtime but different datetime is considered a duplicate. I think that this is not in line with the WIS Manual on WIS, APPENDIX E: WIS2 NOTIFICATION MESSAGE. The section "1.7 Properties / Publication time" contains except other the following statement:

Ensuring pubtime is properly managed for updates and deletions is important for data and metadata download workflows. For example, an out-of-date pubtime can lead to errors for clients when managing updates or deletions in their local copies of data. An update with newer pubtime and identical datetime indicates a newer version of the data or metadata.

Moreover the section "1.11 Properties / Temporal description" makes it even clearer:

The datetime property identifies the date and time of the data (for example, when a measurement was observed). When a data or metadata is updated or deleted, this value should identify the original data or metadata, which can be significantly different from the current time.

My conclusion is, that a notification about a data instance can be a duplicate only if it has the same datetime and the same or older pubtime.