[Seaside] [Q] Tag-Note relationship, any suggestion?

["S.J.Chun"]

Hi, 

my web application uses following classes; 

NOTE: which has "contents" and "tags" 
TAG: which has "name" 

What I want is getting notes using tag and simple but crude idea could be 
using dictionary and set; 

MainDBDictionary(an instance of dictionary). 

inserting: 
MainDBDictionary at: #SomeTagName put: (aSetOfNotesUnderThisTag add: aNewNote) 

fetching: 
MainDBDictionary at: #SomeTagName 

current implentation does not above model; in fact I'm using SQLite but I want to remove 
dependency on SQLite or other RDB. 

Can above model be directly mapped into OODB? For example Magma? 
If not, any suggestion on better design or reference/documentation on this? 

Thank you in advance.