Realization of systems using configurable components involves usage of explicit semantic
descriptions of application domains for their configuring. For encoding of these semantic descriptions
we specified XML language named Ginis Application Definition Language (GADL). In essence,
GADL description of a domain defines layer hierarchy and corresponding services that are used for
connecting with sources of geodata. Describing a WebGIS portal using GADL is a special case where
sources of geodata for a layer can be only WMS and/or WFS.