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eXtensible Markup Language (XML), was created. Which is similar to HTML, also
derived from SGML and containing tags for describing the content of a document.
XML allows data to be described more meaningfully, allowing the semantics to be
inserted into web documents and intranets. As long as it focuses on describing the
data contained on documents and is flexible in that new tags can be added to the data
as needed. As long as they are described in a specific DTD; that is, any developer
community can create their specific tags that serve the purpose of describing their
data, unlike HTML that is intended to control how the data will be displayed [41].
The XML standard is accepted as the emerging standard for web data exchange
which, while allowing authors to create their own tags from a computational perspective, there is very little difference between certain tags. Which in some ways makes
semantic markups created difficult unambiguously used by larger communities. Still,
companies use XML and SGML-compliant standards in their databases and document bases, which enables the interoperability of the company’s internal systems.
Still, it is not enough just to have a flexible language like XML to construct metadata,
but a way to share meaning that is unambiguously intelligible and consensual among
all participants in a community. This can solve the naming explosion problem in
different situations in which a univocal interpretation of data is not possible. Wherein
the Semantic Web scope metadata patterns through the construction of XML code
and a new meaning for the term ontologies have been developed. As the Dublin Core
standard, which is for creating a controlled, albeit limited, vocabulary for use on
the web, based on the assumption that the search for information resources must be
independent of the medium in which they are stored [41–43].
The HTML along with XML and the web has made all online documents a huge
book, inference, and data representation models that transform all data around the
world into a single database that is needed [41, 43].
3.3 RDF
Just as RDF, which is a declarative language written in XML, became a standard
recommended by W3C in 2004. It is a general method of breaking down any kind
of knowledge into parts, with some rules about semantics or the meaning of those
parts. It is also a method of expressing knowledge in a decentralized world pointed
one of the foundations of the Semantic Web. In which computer applications use
distributed and structured information spread across the Web, with a focus on the
simplicity of being able to express any fact yet structured that a Computer application
can do useful things with it [15, 44].
RDF encompasses an ontology standard for describing any type of Internet
resources, such as a website and its content, establishing a metadata standard to
be embedded in XML encoding. RDF has the idea of describing data and metadata
through a resource-property-value “triple” scheme, and a coherent way to access webpublished metadata standards through Dublin Core, or another shared namespace
[45].
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