[fdo-users] Question on associations between classes

Bruno Scott bscott at geomapgis.com
Tue Jul 17 09:28:36 EDT 2007

Can we expect Map or Mapguide to support Object association somewhere in the
near futur?

Bruno Scott

Maksim Sestic wrote:
> Dear all,
> I need to decide on what approach to take regarding logically associated
> classes described by schema:
> 1) My features have annotations
> Each instance of my FeatureClass may have 0..n annotations. Describing
> them is a lesser problem, the general question is - how do I store
> annotations and how do I relate physical class to them? I was thinking to
> resort to standard RDBMS approach - creating Annotations feature class
> (table) with rows (annotation instances) pointing to it's owner (physical
> class). Maybe there's more "proper" approach, as shortly described in FDO
> DevGuide, using other types of Classes than the FeatureClass?
> 2) My features belong to projects
> Each instance of my FeatureClass may belong to 0...n projects. Meaning -
> one feature may belong to two (or more) different projects at the same
> time. Naturally, there's only one instance of a feature class in a
> datastore. Using classical RDBMS approach, I would create Projects table
> with records describing actual projects, accompanied by related table to
> keep pointers on features belonging to that project. What FDO has to say
> about this type of association?
> With kindest regards,
> Maksim Sestic

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