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Question: What are the major building blocks of the Semantic Web?

Answer:

In order to achieve the goals described above, the most important is to be able to define and describe the relations among data (i.e., resources) on the Web. This is not unlike the usage of hyperlinks on the current Web that connect the current page with another one: the hyperlinks defines a relationship between the current page and the target. One major difference is that, on the Semantic Web, such relationships can be established between any two resources, there is no notion of ?current? page. Another major difference is that the relationship (i.e, the link) itself is named, whereas the link used by a human on the (traditional) Web is not and their role is deduced by the human reader. The definition of those relations allow for a better and automatic interchange of data. RDF, which is one of the fundamental building blocks of the Semantic Web, gives a formal definition for that interchange.

On that basis, additional building blocks are built around this central notion. Some examples are:

* Tools to query information described through such relationships (eg, SPARQL)
* Tools to have a finer and more detailed classification and characterization of those relationships as well as the resources being characterized. This ensures interoperability, more complex automatic behaviors. For example, a community can agree what name to use for a relationship connecting a page to one?s calendar; this name can then be used by a large number of users and applications without the necessity to redefine such names every time. (E.g., RDF Schemas, OWL, SKOS)
* For more complex cases, tools are available to define logical relationships among resources and their relationships (for example, if a relationships binds a person to his/her email address, it is feasible to declare that the email address is unique, ie, the address is not shared by several persons). Tools based on this level (e.g., OWL, Rules) can ensure more interoperability, can reveal inconsistencies and find new relationships.
* Tools to extract from, and to bind to traditional data sources to ensure their interchange with data from other sources. (E.g., GRDDL, RDFa)



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Question: What are the major building blocks of the Semantic Web?
Answer:



In order to achieve the goals described above, the most important is to be able to define and describe the relations among data (i.e., resources) on the Web. This is not unlike the usage of hyperlinks on the current Web that connect the current page with another one: the hyperlinks defines a relationship between the current page and the target. One major difference is that, on the Semantic Web, such relationships can be established between any two resources, there is no notion of ?current? page. Another major difference is that the relationship (i.e, the link) itself is named, whereas the link used by a human on the (traditional) Web is not and their role is deduced by the human reader. The definition of those relations allow for a better and automatic interchange of data. RDF, which is one of the fundamental building blocks of the Semantic Web, gives a formal definition for that interchange.

On that basis, additional building blocks are built around this central notion. Some examples are:

* Tools to query information described through such relationships (eg, SPARQL)
* Tools to have a finer and more detailed classification and characterization of those relationships as well as the resources being characterized. This ensures interoperability, more complex automatic behaviors. For example, a community can agree what name to use for a relationship connecting a page to one?s calendar; this name can then be used by a large number of users and applications without the necessity to redefine such names every time. (E.g., RDF Schemas, OWL, SKOS)
* For more complex cases, tools are available to define logical relationships among resources and their relationships (for example, if a relationships binds a person to his/her email address, it is feasible to declare that the email address is unique, ie, the address is not shared by several persons). Tools based on this level (e.g., OWL, Rules) can ensure more interoperability, can reveal inconsistencies and find new relationships.
* Tools to extract from, and to bind to traditional data sources to ensure their interchange with data from other sources. (E.g., GRDDL, RDFa)

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