[rgui-dev] [Fwd: [Yaml-core] schemas: two layers, extensibility]

[Tom Sawyer]

hi all, fowarding this b/c it coincidently deals with a couple things
we've hit on.

i think its interesting that steve mentions small-lests vs. big-lists,
as i was recently thinking about the form vs. function in terms of this
as well. i.e. if you specify that something is selectable, you may then
offer anopther paramter for a compact rendition vs. a verbose. just some
thoughts.

anyway the use of yaml is also interesting. we've been discussin yaml
schemas on the yaml mailing list.

cheers,
tom

-----Forwarded Message-----

> From: Steve Howell <address@hidden>
> To: address@hidden
> Subject: [Yaml-core] schemas: two layers, extensibility
> Date: 03 Sep 2002 11:10:49 -0400
> 
> Tom,
> 
> I like your explanation of how schemas might have different representations,
> depending on what level you were looking at them.  I also agree with you that
> the lower-level representation is the more important one to nail down.  You
> could certainly have a higher-level schema representation be parsed into a
> lower-level representation by some sort of proofreader too.
> 
> Another thing we should consider when making a schema language is 
> extensibility.
> A schema is really just metadata for a particular set of YAML documents.  My
> favorite use case for schemas is generating GUI apps for YAML data, because 
> it's
> a use case that Brian and I implemented successfully with his Perl version of
> YAML.  Suppose you had two different GUI widgets for entering lists, where one
> works better for small lists, and the other works better for big lists.  You
> might want an extra field in your schema for specifying that widget.  A 
> verbose
> syntax makes that easy.
> 
> name: Corporation
> type: map
> items:
>   - name: Board of directors
>     type: seq
>     widget: small_list
>   - name: Employees
>     type: seq
>     widget: large_list
> 
> This simple extension to the schema might save you a ton of custom coding, and
> you can still parse the schema with an ordinary YAML loader.
> 
> Cheers,
> 
> Steve Howell
> http://showell.westhost.com/
> 
> P.S. Tom, my mailer doesn't deal well with PGP signatures, so I can't easily
> qoute your emails.  I'm working on finding a better mailer.
> 
> 
> 
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-- 
tom sawyer, aka transami
address@hidden

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