Contents of Semantic Web

To achieve above mentioned goals of the main importance is to have an opportunity to define and describe relationships between data (i.e. resources) in Network. It doesn’t differ much from hyper references using in modern Internet which connect current web-page with another one: hyper references determine connection between current page and aimed one. The main distinction is that in Semantic Web such connections can be established between any two resources, such definition as “current page” is absent. Another important distinction is that connection (i.e. reference) itself is named, while references used by people in (traditional) Internet are not named and their role is defined by reader. Defining of such connections lets organize more qualitative and automatic data exchange. RDF, being one of the fundamental building blocks forming Semantic Web gives formal means for such exchange.
Additional building blocks are leaned on this basis. Let’s give some examples:
• Instruments for inquiry of information described due to such relationships (for example: SPARQL)
• Instruments for forming of more exact and detailed classification and description of such relationships characteristics. It guarantees ability to interact and more complicated kinds of automatic processing. For example: community can make arrangements about the name to use for description of reference connecting a page with a calendar. This name, then, can be used by a big number of different users and applications without necessity to redefine such names (for example: RDF Schemas, OWL, SKOS) every time.
• In more complicated cases there exist special instruments to define  logical intercommunications between resources and connections (for example: if reference connects person with his/her address we can say that e-mail address is unique, i.e. address does not divided into few people (for example: OWL, Rules)
• Instruments for extraction from and for connection with traditional data sources to guarantee their ability to exchange information with another sources (for example: GRDDL, RDFa).