[gnome-db] GDA xml and questions

[Sandro Dias Pinto Vitenti <sandro isoftware com br>]

Hi,

I'm studding libgda and have some questions:

1 - Make any difference to put a nullok='TRUE|FALSE',
    inside a parameter description in a query?
    Like those in the example of 
gda_data_model_query_set_modification_query
    usage, delivery_before=## [:name="+2" :type="date" :nullok="TRUE"]?

2 - I think that the dictionaries using xml idea is great, is it original?
    Is there another implementation like that?

3 - In the xml, why use long names like 'gda_dict_types'. Could we just 
use 'types' and a
    'gda' or 'gda_dict' namespace when needed?

4 - Why do you use all those ids in the xml? Look like you did that to 
easily translate
    to a hash table. But it wouldn't be better use xpath more 
extensively? For example,
    /gda_dict/gda_dict_types/type[ name='xxxxx'] to get a type named 
xxxxx or
    
/gda_dict/gda_dict_database/gda_dict_tables/gda_dict_table[ name='table1']/gda_dict_field
    to get all fields from table 'table1'.

5 - gda_dict_constraint shouldn't be a child of  
gda_dict_table|gda_dict_field?


I just started to study libgda/libgnomedb so if my questions are already 
answered or
discussed please send me a link.

Thanks

Sandro Vitenti