For features contained in EDB layers, links with records of tables or queries can also be created. However, as distinct from feature types of map layers and work layers, the feature types of EDB layers can be linked only with tables and queries of the same EDB. Correspondingly, all auxiliary data providing for linking features with records should also be stored in the same EDB, in one or another way.
ObjectLand supports two modes of linking features of EDB layer with table records of this EDB. These modes have much in common with direct and indirect links described above in the subsection “Link mode”. The difference is in methods of storing auxiliary data about links.
Link by feature number is similar to the direct link for GDB features. A link of a layer's feature type with a table or a query of the same EDB is set via specifying of a field of this table (query) which contains the inner number of the feature linked with the corresponding record of the table.
Link by user key is similar to the indirect link for GDB features. The link is set using additional data fields bound to the layer's features (fields of user key). Such fields are to be defined by the user when creating the layer.
