I use TiddlyWiki to manage sources (books, movies etc), and I want to 
create an easy way to add tiddlers for individual sources.

I have decided to add tiddlers that represent a "source-type", and then use 
it to generate a form that allows me to enter metadata for a new source. 
For example I might have a source type "Book", which is used to generate a 
form like this:

Title: ...
Author: ...
Year: ...

While "Movie" might have a form like this:

Title: ...
Director: ...
Producer: ...

Obviously I need to associate the required metadata-fields with their 
source-type. I can think of two ways to do this:

   - Add a field to each tiddler type called "required-fields" which lists 
   the required metadata-fields.
   - Create separate tiddlers for each possible metadata-field, then tag 
   them with any source-type that requires them.

It's not obvious to me that there is any functional difference between 
these two options, but if I make a bad choice it will be difficult to 
change down the line. So my question is: *Is there a reason that one of 
these approaches is better than the other?*

Thanks in advance for you help.

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