Semantic Web

The semantic Web, is a computer industry and the Internet industry next phase of network to developing the term definition, its basic meaning which based on network establish any data connection, this tiny connected not only confined to Web pages. Thus, any tiny data with other information can be "communicate".

meaning

The existing Internet network is a collection of web pages, and Google and other search engines are through a web link between each other to help users go online search. In contrast, "the semantic Web" will be in more tiny information to establish direct connection between, such as street address and a map, etc.

use

The father of the world wide Web, says Tim Berners - Lee him self using "the semantic Web users will be far better than existing network can be applied in any of the things function. He said that in "the semantic Web", the user can put two irrelevant things together, for example the bank reported bills and a calendar. The user can drag Banks quote bill calendar, can also drag bank report calendar, so that they could on the bill shall be paid in know when. He points out that "the semantic Web" will emerges as a all data "seamless" type connected network. In "the semantic Web" (semantic Web) technology speared out on Facebook, at present people after the social networking sites such as MySpace and "obsession" will be "have no don't even replaced" network.

Technical challenge

Experts say, "the semantic Web" the biggest challenge faced with right now is to find a way to say all of the data. Consequently, in the connected to the network, a data can identify and establishment and other information related to link, this with the so-called "marked" (tagging) somewhat similarities.

2008.3.16 14:00

The semantic Web system structure:

The semantic Web implementation dependent on YuSanDa key techniques: XML, RDF and Ontology.

The semantic web seven layer system structure

Below describes the semantic Web seven layer architecture:

First floor: Unicode and URI.

Unicode is a character set, this character focus all characters with two bytes, can say 65536 a character, basically include all the languages of the world characters. Data formats using the advantage is that it's support Unicode all main language in the world, and can be mixed and retrieval. URI (Uniform ResourceIdentifier), namely Uniform resource locator, used for only a logo network concept or resources. On the semantic Web system structure, this layer is the semantic Web based, including the Unicode responsible for handling resources coding, URI responsible for resource identifier.

Second: XML + NS + xmlschema.

XML is a streamlined SGML, combining the SGML's rich function and HTML ease-of-use, it allows users in the document to join any structure, and don't need to explain these structures of meaning. NS (NameSpace, NameSpace) is determined by the URI index, the purpose is to avoid different applications use the same characters describe different things. XML Schema DocumentDataType) is a DTD (substitute for itself, but using XML syntax than DTD more flexible and provide more data type, can work better for effective XML document services and provide data validation mechanism. Because the XML flexible structure, the NS by URI index caused by the data can be provided XMLSchema uncertain and a variety of data types and inspection mechanism, make it become the semantic Web system structure of the important component. This layer is responsible for representing data from grammar on the content and structure, by using standard language will network information form of expression, data structure and content separation.

The third floor: RDF + rdfschema.

RDF is a description of the information resource in the WWW one language, its goal is to establish a standard for a variety of metadata coexist framework. The framework can make full use of the advantage of metadata, the data exchange based on Web and recycle. RDF solution how to use XML standard grammar is to describe unambiguous, makes the resources object described resources metadata information becomes machine understandable information. If the XML see as a standardized metadata syntactic specifications, then the RDF can see as a standardized metadata standard semantic description. Rdfschema using a machine understandable system to define describes resources, its purpose is the vocabulary of mechanism or provide vocabulary embedded in the frame, under the framework of vocabulary can integrated together to achieve the Web resources description.

The fourth floor: Ontology vocabulary.

This layer is based on RDF (S) on the concept and the relationship of defined abstract description, used to describe application domain knowledge, describe various resources and resources to the relationship between the vocabulary, realize the expansion. In this layer, the user can not only define concepts and can define the relationship between the concepts of rich.

The fifth to the seven layers: Proof, questions, Trust.

Questions is responsible for providing justice and reasoning rules, and once established, can questions by logical reasoning for resources, resources relationship and reasoning results were verified, proof its effectiveness. Through the Proof exchange and digital signature, establish a trust relations, so as to prove the semantic Web output reliability and its compliance with the requirements of the customers.