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How to represent many-to-many relation?
- To: zigzag@xxxxxxxxxx
- Subject: How to represent many-to-many relation?
- From: Mark-Jason Dominus <mjd@xxxxxxxxxx>
- Date: Wed, 04 Nov 1998 16:30:08 -0500
- Cc: mjd@xxxxxxxxxx
- Organization: Plover Systems
- Reply-to: zigzag@xxxxxxxxxx
I'm going to get a contract to write a book, but I don't know yet what
book it is. There are six or seven possibilities open.
Each possible book has some overlap with the others.
I also have ideas for chapters, each of which has a topic. Some
chapters are appropriate for several books.
For example, let's suppose that Book A will contains chapters on
topics X and Y; book B will contain chapters on topics X and Z; and
book C will contain chapters on all three topics.
I can't use d.contents and d.inside because if I do, no topic can
be in the contents of more than one book:
Book A --- Topic X
Book B --- Topic X
This is illegal, because here Topic X has two links in the -d.inside
direction, and that is Not Allowed.
What's a good way to represent this idea in Zigzag?
Mark-Jason Dominus mjd@xxxxxxxxxx