[Data-modeling] Adding a date/time CVT to organization members

[Jeff Prucher]

I think Robert's responded to the underlying issues behind your question,
but to answer the specific question, there are actually a lot of properties
for which values will not change over time. Here's a list, just off the top
of my head:

Most properties on creative works -- author of a poem, performer on a
musical track, media of a painting, cover artist for an edition of a book,
director of a film, etc.
Contents of a magazine issue
Parent/Child/siblings (of a person or other organism)
Vineyard a vintage of wine's grapes were from
Maximum force of a (past) cyclone's winds

Jeff Prucher

> -----Original Message-----
> From: data-modeling-bounces at freebase.com 
> [mailto:data-modeling-bounces at freebase.com] On Behalf Of Jeff Thompson
> Sent: Friday, February 22, 2008 11:24 PM
> To: Freebase data modeling mailing list
> Subject: Re: [Data-modeling] Adding a date/time CVT to 
> organization members
> 
> Each time this comes up, it's my job to be the a**h*ole and 
> ask the converse question:
> Can you say what properties on any type you will *not* need 
> to track changing values over time...
> 
> Jeff Prucher wrote:
> > We have had a request to insert a CVT between the types 
> "organization" 
> > and "organization member" in order to be able to track information 
> > about the periods over which members have belonged to 
> organizations. 
> > The CVT will simply add start and end dates. (The properties that 
> > would be affected are /organization/organization/members and
> > 
> /organization/organization_member/member_of_these_organization
> s.) This 
> > is a very straightforward fix to do, but doing so will break any 
> > applications using these properties.  Is anybody using these 
> > properties, and if so, would this be a problem for you?  
> We'd probably 
> > make the change in the middle of March.
> > 
> > Jeff Prucher
> > Type Librarian & Ontologist
> > Metaweb Technologies, Inc.
> > 
> > 
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