[GRASS-user] Modelling 1:n and m:n relationships in GIS

Markus Metz markus.metz.giswork at googlemail.com
Tue Mar 10 10:13:44 EDT 2009

Moritz Lennert wrote:
> On 10/03/09 12:57, Markus Metz wrote:
>> I have updated the vectorintro (vector/vectorintro.html) in grass64, 
>> grass65 and grass7.  "Attribute management" has been changed to 
>> "Vector object categories and attribute management".
>> Please check for and report any errors/inconsistencies or if the 
>> changed description is incomprehensible.
> I just slightly corrected it (r36308+r36309). I don't have a copy of 
> grass64 on my machine at the moment. Could someone merge this into 64 
> for me ?
Done. And explained a bit more clearly in the part on layers. I 
emphasized that a category number must be defined for a given layer if a 
vector object should link to the attribute table used for that layer.

Markus M
> Main point: "In order to link one vector object to several attribute 
> tables, several category numbers per vector object are needed."
> This is a bit misleading, so I erased it. Actually you need different 
> layers, and thus category numbers in different layers. As this is 
> explained in the part on layers, I decided to erase this sentence.
> Moritz

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