Rating - new/changed properties in VMHub

[bquinn]

In discussion on #3 , we decided that it made sense to separate the "government authority audience classification" type rating (e.g. "MPAA PG-13") from the "user review" type of rating (e.g. "Rotten Tomatoes gives this movie 98%").

Michael explained that the original design was meant to cover both types of review - and the idea was that the "Rating Source Link" could be used to distinguish between the two types.

But the group now feels that this is too confusing, and makes it difficult to map to other standards which use two separate fields for the two types of ratings.

For example, schema.org uses https://schema.org/Review for the "I give it 5 stars" type of rating, and https://schema.org/Rating for the government classification scheme.

So looking at the relevant fields, here is what we think we would like to do:

1. Change the existing "rating" field to cover only MPAA-style audience ratings. schema.org calls this contentRating.

Current Rating property definition:

Property Group	Property Name	Definition / Semantics	User Notes	Change Notes	Basic Type/Cardinality	EBUcore Property	XMP Property
administrative	Rating	How the video is rated by a public source or an authority		New 1.0	Rating structure (0..unbounded)	rating/ratingValue or rating/ratingLink where rating is explicitly described like a web reference	Iptc4xmpExt:Rating

Proposed new rating definition: Property Group	Property Name	Definition / Semantics	User Notes	Change Notes	Basic Type/Cardinality	EBUcore Property	XMP Property
administrative	Rating	How the video is classified by a public authority such as MPA		Changed 1.4	Rating structure (0..unbounded)	audienceRating	Iptc4xmpExt:Rating

2. To cover the "newspaper review" angle of "we give this movie 4 out of 5 stars", we can use a Review property.

So we propose a new property:

Property Group	Property Name	Definition / Semantics	User Notes	Change Notes	Basic Type/Cardinality	EBUcore Property	XMP Property
administrative	Review rating	An aesthetic rating given to the video by an external reviewer such as a news outlet		New 1.4	Rating structure (0..unbounded)	rating/ratingValue or rating/ratingLink where rating is explicitly described like a web reference	Iptc4xmpExt:Review

3. A third use case is the original use of xmp:Rating which was adopted into Photo Metadata Standard as Image Rating, which is usually used internally to a system to track good shots within a series, as part of a photo edit workflow. This could also be called "Star Rating" or even "Workflow Rating".

So we propose a new property:

Property Group	Property Name	Definition / Semantics	User Notes	Change Notes	Basic Type/Cardinality	EBUcore Property	XMP Property
administrative	Workflow rating	An aesthetic rating given to the video by its creator, for example to mark the best take of a series		New 1.4	Rating structure (0..unbounded)	rating	xmp:Rating

Rating structure:

The rating structure can be used by all three of these properties, but not all of the properties apply in each case. The same happens in schema.org and EBUCore.

Therefore we don't need to update the rating structure.

Property Group	Property Name	Definition / Semantics	User Notes	Change Notes	Basic Type/Cardinality	EBUcore Property	XMP Property
Rating Value	Rating value as issued by the rating source	rating/ratingValue	Iptc4xmpExt:RatingValue	ratingValue			VMD <--> NMLG2: PROPERTY/@value						RatingValue
	Rating Source Link	Link to the site and optionally the page of the party which has issued the rating value, linked resource should explain the rating rules.	rating/ratingLink	Iptc4xmpExt:RatingSourceLink	ratingSourceLink			VMD <--> NMLG2: PROPERTY/@ratingtypeuri						RatingSourceLink
	Rating Scale Min Value	The value of the rating scale used for the lowest/worst rating	rating/ratingScaleMinValue	Iptc4xmpExt:RatingScaleMinValue	ratingScaleMinValue			VMD <--> NMLG2: PROPERTY/@scalemin						RatingScaleMinValue
	Rating Scale Max Value	The value of the rating scale used for the highest/best rating	rating/ratingScaleMaxValue	Iptc4xmpExt:RatingScaleMaxValue	ratingScaleMaxValue			VMD <--> NMLG2: PROPERTY/@scalemax						RatingScaleMaxValue
	Rating Value Logo	Visualisation of the rating value referenced by a link	rating/linkToLogo	Iptc4xmpExt:RatingValueLogoLink	ratingValueLogoLink									RatingValueLogoLink
	Rating Region	Geopolitical region to which this rating applies.	rating/ratingRegion	Iptc4xmpExt:RatingRegion	ratingRegions

[bquinn]

Resolved with the release of VMHub v1.4