A Look at Semantic Web Technology and the Potential Semantic …
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reflecting on the aspect of that particular DLs characterized by a set of constructors
which provide building of complex concepts and roles from simpler ones. Still evaluating the Semantic Web’s point of view provide well-defined semantics (are logics)
still evaluating the provision of inference services [35, 36].
In summary, web ontology language is based on Description Logic, which
are logic-based KR (Knowledge Representation) formalisms with emphasis on
reasoning, and provide ontology design and expressivity. Description Logic is
equipped with a terminological and an assertional formalism, and the large knowledge bases that ontologies needed, integration, and deployment supported by
reasoning [35, 36].
A web document is a mixture of data and metadata, the term “meta” being relative
to a self-referencing prefix, so that “metadata” is “data over data”. Meaning the
function of specifying characteristics of data that describe its meaning in a context,
or even the way it will be displayed, used [35, 36].
3.1 HTML
The language still used today for the construction of most web pages is HTML
(HyperText Markup Language) containing a set of tags, which make syntactic
markers with descriptive power of data and commands for manipulating a document. This is derived from the standard SGML (Standard Generalized Markup
Language), what in turn, is based on the idea that documents contain structure
and other semantic elements that can be described without reference to how these
elements will be displayed. That is, it is a metalanguage, respective to a language
for describing other languages. Also considering that HTML tags are usable by a
language derived from SGML, called DTD (Document Type Definition). Thus, the
HTML language is a defined set of tags, or an SGML-specific DTD, by having the
purpose of constructing documents for display on computer devices (on the web)
[37–39].
A web browser reading an HTML document interprets these tags by deciding how
the data will be displayed. So, today’s browsers interpret HTML because the DTD for
defining HTML is fixed, and is known a priori by the browser interpreter. Although
different browsers can interpret some display definitions in a particular way, the
structure of HTML is rigid, i.e., without a language. In this sense, consequently,
a browser update to interpret new tags, there is no possibility of adding new tag
commands [37, 40].
3.2 XML
From the limitations of HTML and the needs of a language that describes the structure
and display of documents, as well as semantic content and contextual meanings,
65
reflecting on the aspect of that particular DLs characterized by a set of constructors
which provide building of complex concepts and roles from simpler ones. Still evaluating the Semantic Web’s point of view provide well-defined semantics (are logics)
still evaluating the provision of inference services [35, 36].
In summary, web ontology language is based on Description Logic, which
are logic-based KR (Knowledge Representation) formalisms with emphasis on
reasoning, and provide ontology design and expressivity. Description Logic is
equipped with a terminological and an assertional formalism, and the large knowledge bases that ontologies needed, integration, and deployment supported by
reasoning [35, 36].
A web document is a mixture of data and metadata, the term “meta” being relative
to a self-referencing prefix, so that “metadata” is “data over data”. Meaning the
function of specifying characteristics of data that describe its meaning in a context,
or even the way it will be displayed, used [35, 36].
3.1 HTML
The language still used today for the construction of most web pages is HTML
(HyperText Markup Language) containing a set of tags, which make syntactic
markers with descriptive power of data and commands for manipulating a document. This is derived from the standard SGML (Standard Generalized Markup
Language), what in turn, is based on the idea that documents contain structure
and other semantic elements that can be described without reference to how these
elements will be displayed. That is, it is a metalanguage, respective to a language
for describing other languages. Also considering that HTML tags are usable by a
language derived from SGML, called DTD (Document Type Definition). Thus, the
HTML language is a defined set of tags, or an SGML-specific DTD, by having the
purpose of constructing documents for display on computer devices (on the web)
[37–39].
A web browser reading an HTML document interprets these tags by deciding how
the data will be displayed. So, today’s browsers interpret HTML because the DTD for
defining HTML is fixed, and is known a priori by the browser interpreter. Although
different browsers can interpret some display definitions in a particular way, the
structure of HTML is rigid, i.e., without a language. In this sense, consequently,
a browser update to interpret new tags, there is no possibility of adding new tag
commands [37, 40].
3.2 XML
From the limitations of HTML and the needs of a language that describes the structure
and display of documents, as well as semantic content and contextual meanings,