DDA Layer

Features in the K2 layer communicate in turn with the Dynamic Data Access (DDA) layer, the lowermost layer in the architecture. This layer contains driver-level modules that access and process external data. There are three kinds of DDA modules:

Gateways, which provide read-only access to information repositories (see Information Repositories).


Document filters, which process documents of different formats read in through the gateways (see Verity Document Filters).


Locales, which perform character conversion and apply language-specific indexing techniques to document content (see Locales).


Taken together, these main software layers provide the support for Verity intelligent content services, as shown conceptually in Figure 1-4.