Dublin Core standard is an information classification method, which is often used in libraries. The Dublin Core standard has an XML Schema that defines how to use XML to describe such information. Dublin Core can effectively catalog various kinds of information and make them easy to modify, query and use.
The current application of Dublin Core in information description and definition makes the Semantic Web a reality. By using a unified standard to describe data, and more importantly, by using well-designed and proven solutions, data in other XML documents can be described in detail, so that information can be effectively exchanged and compared between different sources.
The Dublin Core specification has its own schema, but its purpose is to embed larger XML documents and use XML namespaces to define DC elements needed to describe other data in documents. As an example, read Listing 10 to see how to use the DC classification system in RDF XML schemas to describe the content of RDF entities, such as websites. To do this, you can extend the structure in the previous RDF schema example.
Listing 10. Describing the content of an RDF entity in an RDF XML schema using a DC classification system
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<dc:subject>MCSLP, Grids, XML, Databases, Programming </dc:subject>
<dc:rights>Copyright 2008, MCSLP</dc:rights>
Listing 10 uses DC elements to add description, subject, publisher, copyright, and identifier information to categorize RSS feeds.
The complete Dublin Core Metadata Elements Set consists of 15 metadata elements.
This provides a wide range of descriptive information.