GdaReferer Interface to know when on object is completely defined Some objects can be initialized in an uncomplete state. This is the case for example of a primary key database constraint, when we don't know, at creation time, which field it applies to. These objects implement this interface to at least signal when they are ready to be used. Also some objects need to be created before other objects they will need to be operational even exist; they implement this interface. This interface is particularly important for the #GdaQuery and related objects: the individual components of a query are completely defined when they reference objects defined in a data dictionary (a #GdaDict object). When any of the components of a query relates to an element not defined in a dictionary, the query can still be used but it's not completely defined. @dbreferer: the object which received the signal. @dbreferer: the object which received the signal. @iface: @Returns: @iface: @iface: @Returns: @iface: @Returns: @iface: @replacements: