Conventional site document structure is a hierarchical tree with information area in its root. Each site of the space is the basis of its own structure branch. The next tree level is represented by language versions of sites, each containing pages (sections). The SAPI specification allows describing the “visibility” scope for SAPI objects in the common document structure of the information space. For this purpose, the namespace for referencing during data container generation is defined by the SAPI:NAMESPACE element. The namespace definition describes the way it is connected to the areas of common document structure of information space