Hi, I was thinking a lot around metadata implementation and came up with the following. I have created 3 tables: MetaObject, MetaObjectProperties and MetaObjectRelations. In DHIS2 schema most of MetaObjects (DE, Indicators, DS, DECategoryCombo, DECategory, DEOption) have one one to many relations. So I read each object and placed its property values into MetaObject. After all goes well I put id of MetaObject back to original object's metaCode persisted field, added to IdentifiableObject inherited by all metadata objects. Instead of objects Id I added its metacode as its reference to other objects. In listings of each metadata objects' interface I added add to metadata link, which will add this particular object into MetaObject. After all metaobjects are added into MetaObject table, we can easily rebuit our other objects with their links to other objects. This also should be useful for new installation, once we create XML representation of MetaObject. Similarly we can use MetaObject for transfering data (import/export) between nodes of the same metaobjects as all have exactly same metacode. Implementation is here https://code.launchpad.net/~murodlatifov/+junk/dhis2
regards, murod
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