In an HTML document, there are paragraph elements (represented by <p></p>, text formatting elements such as bold (represented by <b></b>, and the element itself (represented by <html></html>. All of these kinds of elements define the appearance and layout of a document when it is rendered by web browser software. The meta element, on the other hand, is used to define the content of a document. In the use of a basic card catalog, we can search by author, title, and subject. Online public access catalogs (OPACs) give us very precise access to information by allowing us to search by date, keyword, and series, as well as the author-title-subject access points of the traditional card catalog. In order to create this sort of precise access to web-based documents, a new standard has been developed to allow the cataloging of digital information. This new standard is the Dublin Core Initiative. Author explains what the 15 elements Dublin Core defines for recording information about the content of a digital documents.
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