Filtering for Calendar Syndication
Calendar syndication should support filtering. Clearly there is the default filter of "Joe's Calendar". The other filter is "All Calendars". I think these cases are handled If I am reading aright, the second is get a list of calendars, then batch them).
Within those sets, further filtering should be supported. I see the requirements as temporal, geospatial, and semantic.
1) Temporal. This should be in the form of 0 to many Vavailability objects. I would be content with 0 to 1. (Only syndicate the events during my business hours)
2) Geospatial. WS-Calendar events MAY include a lat/long. A requester should be able to request a GIS zone of interest. I recommend OGC Profile level 0 as the right level of complexity.
3) Semantic. A Calendar server may have semantic tagging for Events. These should be treated simple text tags. Any ontology or normative semantics is out of scope. A calendar server may be able to list the tags it has. That is out of scope. These might be "Graduate Seminars" or "Home Games" or "Executive Meetings". A requester should be able to request only events that match (Or don't match) these tags.