Proposal: New TelevisionChannel type for TV listings

Schema.org currently has types for BroadcastService and TelevisionStation,
but there is no notion of a channel in a given TV line up as one would find
from a satellite or cable provider.

This proposal is to add the following:

- New type TelevisionChannel for a specific channel in a provider lineup.
Properties include:
    - channel: for the identifier (usually a number) in a provider's lineup
    - station: The TelevisionStation associated with the channel
    - inLineup: linking a channel to a BroadcastService (e.g. Comcast cable)
    - serviceTier: A text description of the service needed to access the
channel (e.g. premium)

- New properties on TelevisionStation:
    - affiliateOf: The broadcast network(s) associated with a
TelevisionStation.
    - displayName: The name the station uses on its display. For example,
WAAY may display as "ABC".
    - timezone: The timezone the station uses when publishing its lineup.

Details and some examples can be found in my GitHub repository at
https://github.com/vholland/schemaorg/commit/fe3fa6fea747f7080f1811a86bb35de8ac691989


Please comment here or on GitHub issue# 329
<https://github.com/schemaorg/schemaorg/issues/329>.

- Vicki

Vicki Tardif Holland | Ontologist | vtardif@google.com