The cadastral reality can be described by means of three basic notions: a relation notion . used in mathematics . and also the spatial cadastral element and the map module . defined earlier by the author. As a result, the cadastral reality can be written by means of the following three sets . connected with each other by the spatial cadastral element identifiers: G the state of development, P legal status, M . map modules. The form of data stored in a database and the form of usage data . open to cadastre users in the natural language are quite different. The less transformed are the data stored , the slower grows the volume of the part of the database storing them. In the most general approach, there are two factors taking part in the cadastre:A the human factor, and B the instrumental factor. The Afactor has consciousness, contrary to the B factor which has not. The B factor is totalny subordinated to the A factor. While the A factor acts consciously, the B factor serves only as a tool, as an instrument or in the best case as an automatic machine . always subordinated to the A factor. The B factor can be identified with the information system, which . together with the Afactor . forms the cadastre institution. Then, the following functional modules of the information system can be distinguished: B1. the data storing, e.g. in G-P-M files format, B2 creating data files for specified areas (e.g. cadastral district), updating these data files and archiving the outdated data, B3 providing the cadastre users with the access to proper data, generally in the form of values of .functions. performed on the stored data, B4 modifing the B1 module (including G-P-M files according to their structure changes) as well as the B2 and B3 modules within upgrading of the system. All these elements (B1, B2, B3 and B4 modules as well as G-P-M files) change in time. The states of these particular modules and the states of these files are assigned to specific time intervals on one common time axis. As a result, the information concerning any point of the space-time continuum of the cadastre reality is accessible.