Add schema elements to a model by inserting
them into the appropriate collection.
Elements are removed from the model by using
either of the following methods:
Call
the FdoSchemaElement::Delete() method. This flags the element for
deletion when the changes are accepted (generally through FdoIApplySchema),
but the element remains a member of all collections until that time.
Remove
the element from the appropriate collection via the FdoSchemaCollection::Remove()
or FdoSchemaCollection::RemoveAt() methods. This immediately disassociates
the element from the collection.
