[fdo-users] Object and Association Support

[Crispin_at_1Spatial]

All,

We are looking at the capabilities of FDO for modelling "rich / complex
objects".  There are two approaches to this, AFAIK, namely 'Object
Properties' and 'Association Properties'.

It appears that client-side support for both is poor but that doesn't worry
me at the moment.  What I want to achieve is a homogenised way of handling
such things.

There was a discussion by JNg on scope for FDO Toolbox
(http://osgeo-org.1803224.n2.nabble.com/Questions-about-advanced-schema-elements-td4163239.html#a4163239)
but little else.

Could I get clarification on a couple of things?


 1) Association Properties
a)Is SDF the only provider to support them?  Where is this defined in the
provider capabilities?
b)Is this analagous to having relational constraints in the provider - and
how, therefore would it be different to joins when querying information?  Is
it like an implied view or better than that?
c)Is there potential to do clever queries like
"PrimaryClass.SecondaryAssociation.Value = 1" ?


 2) Object Properties
a) Are there any providers that support them?  Where is this defined in the
provider capabilities?
b) Is there potential to do clever queries like
"PrimaryClass.SecondaryObject.Value = 1" ?


Thanks - I expect this is a bit specialised but someone (Orest?) designed
this and it would be good to be able to put it to work.

 Crispin

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