Standardization in the field of GIS has led to a series of specifications and standards that define structure and encoding rules of data and interfaces of services provided by ISO TC 211 (ISO 19100 series) and OpenGIS Consortium. This set of standards provides syntactic interoperability of geospatial data and services, but does not solve semantic problems. In order to achieve semantic interoperability i.e. explicitly define the meaning of data and services to make them understandable both to machines and humans, attempts are made to develop geospatial semantic web, where not only the structure of data will be visible but semantics as well. The paper gives an overview of technologies and methods for semantic markup of OGC (Open Geospatial Consortium) services and associated resources in order to use existing semantic infrastructure. Examples are given for cadastral data.
