IRJET- Semantic Web Mining and Semantic Search Engine: A Review

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1419
Semantic Web Mining and Semantic Search Engine: A Review
Nitika Uppal1, Shivani Rana2, Avni Sharma3
1Student, Department of Computer Science, HPTU University, Himachal Pradesh, India
2,3Assistant Professor, Department of Computer Science, HPTU University, Himachal Pradesh, India
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Abstract – Web 2.0 is the current web which we are using.
This current web can only read the data simply but cannot
understand its meaning. Semantic web is extended version of
current web. Semantic web is the way to put the data on the
web in a form that a machine can easily understand. It is the
way to retrieve exact and accurate data from the web.
Extracting exact and useful data from semantic web is called
as semantic web mining. Main aim of semantic web mining is
to combine both the semantic web and web mining. And for
the retrieval of the data from the web search engines are
required. Semantic search engines provide the facility to
retrieve more meaningful data from the web. This paper
provides a brief overview about the semantic web, semantic
web mining and semantic search engines. In thispaperwe will
also discuss the challenges for semantic search engines upon
which further research can be done.
Key Words: Semantic Web, Semantic Web mining,
Semantic search engines, RDF, Ontology.
1. INTRODUCTION
In computer science Mining is the process of extracting
Useful knowledge or information from a huge amount of
data. Mining can be of three types, Data mining, web mining
and Text mining. The data for mining can be available either
in structured or unstructured form. Data mining mainly
deals with structured data organizedina databasewhiletext
mining mainly handles unstructured data/text [1]. Web
mining deals with both structured and unstructured data.
The Semantic Web was thought up by Tim Berners-Lee,
inventor of the WWW, URIs, HTTP, and HTML [2]. Semantic
web is the extended version of the current web which is also
known as web 2.0 and its enhanced version is knownasweb
3.0(semantic web). Semantic web mining isthecombination
of two words as, semantic web and web mining i.e. the
process of mining the semantic web. Semantic Webprovides
those features which are not included in web 2.0. In Web 2.0
machine can read the words or contents provided in user
query but cannot understand their meaning. Our Web
contains unstructured form of data, which can be
understood by human but not by the machines.Tomakethis
data machine understandable we need the concept of
semantic web mining, where semantic web makes data
machine understandable and web mining is used to extract
useful patterns or knowledge from this data. Semantic web
information can support data integration, data discovery,
navigation and automation of tasks [3].
To answer the user query there are so many search engines
like Google, yahoo etc. But these search engines are not so
efficient that they can provide exact answer of user query.
They deliver the answer linguistically correct but in larger
amount. In the present era, it takes too much time to search
for the exact data from different links so new generations
prefer semantic search enginesbecause efficientsearchingis
needed to get a well-defined and quality result [4].Semantic
search engines provide information in precise manner with
well define impression. A semantic Search engine uses
various semantic technologies like RDF, Ontology etc.
The purpose of the paper is to provide an overview of
semantic web mining and semantic search engines. The
framework of semantic web mining and various semantic
search engines with their different search approaches are
discussed in this paper.
2. SEMANTIC WEB
The concept of semantic web was introduced by Tim Berne
Lee in 2000. Semantic web is anextensionofthecurrentweb
in which information is given well definedmeaning,enabling
computers and people to work in cooperation efficiently
[5].The word semantic means study of meaning in a
language, and main goal of semantic web is to make this
meaning understood by machine. When user provides a
query, the machine interprets the words in the query
without understanding their meaning. If user changes the
pattern of his query then pattern will change but the
semantic will remain same. It means by changing the
structure of the sentence, its meaning is not changed.
For example, there are logical sentences as –
1. Arun is a father.
2. A father is a parent.
Therefore Arun is also a parent, but the given logic is
grasping by human not by a machine. Semantic web can
address this problem by using some rules and techniques
due to which a machine can understand the semantics and it
will be able to provide exact result of user query. The effort
behind the Semantic Web is to add semantic annotation to
Web documents in order to access knowledge instead of
unstructured material,allowingknowledgeto bemanagedin
an automatic way [6].

2.1 Architecture of semantic web
The main objective of Semantic web is to make the current
web more intelligent by altering its structure of data on the
current web so that this data can be easily linked, processed
and delivered to the users.
The data on the current web is in unstructured(images/text
/HTML) or in semi structured (XML) form. But the semantic
web is used to convert this data into structured form. For
this it make use of common data formats and exchange
protocols on the web, and most commonly the Resource
Description Framework (RDF), which is based upon Web
ontology language (OWL).
Fig-1: Architecture of Semantic Web; Source-W3C
The architecture of semantic web is composed of many
layers which provide a more standardized way of
development.
1) Unicode: It belongs to the bottom layer which is the
World Wide Web layer of the architecture. It is an
international standard of encoding, which is used to
assign a unique numeric value to each and every
character of a language or program that is independent
of the underlying platform. Before this standard,
different encoding standards were used by web which
may cause conflicts during standardization. But now,
Unicode solved this problem by providing a standard
format of encoding.
2) URI: URI stands for Uniform Resource identifier or also
called as Uniform Resource locator.Inordertoidentifya
resource uniformly on the web, a formatted string is
used, which is known as URI. URI provide a standard
way to access the resource by other machine across the
network or over the World Wide Web.URI is similar to
URL in order to specify the location of a file. Both are
used interchangeably. The complete form of URL is
referred as absolute URI.
3) XML: XML stands for extensive markup language, much
like HTML. It is a W3C recommendation. It is a self
descriptive language which is a public standard. It
allows us to store the data rather than how it will be
presented.
4) RDF: It is an acronym for Resource Description
Framework. It is used to provide a standard framework
for data interchange and describe the resources on the
web. There is a need of some conventional tools for
dealing with data and the relationship between data on
the web, and RDF is one of the most powerful tools
designed for this purpose. RDF defines a modeling
technique in which data is defined in the form of triples.
These triples express information in the graphical form.
5) RDFS. Resource Description Framework Schema isused
to define a vocabulary to RDF data model. It is used to
describe specific kind of resources along with their
specific properties. RDFS vocabulary provided in the
form of RDFS concept which makes uses of classes and
properties to describe resources.
6) Ontology: Ontology is one of thebasicbuildingblocks of
semantic web. It is a knowledge set which is related to a
particular domain and it also defines the relationships
that hold between them. This relationship maybedirect
or inverse. For expressing ontologies there areontology
languages such as OWL (Web Ontology Language). It
provides a common model for data representation that
allows the user to link one piece of information to other
piece of information.
7) Logic, Proof & Trust: Logic layer is used to obtain the
conclusions and describe how these conclusions should
be used for the implementation of the semantic web.
Proof layer is used to for the verification of the results
produce by applying various logics. Finally the trust
layer is used to enhance the trust level between users
and source of information.
3. SEMANTIC SEARCH ENGINES
To retrieve information from web, search engines are
required. With the development in the web, search engines
are also developed. Under web 2.0, search engine retrieve
those contents that contain keywords that are presentinthe
given query. Due to the unstructured behavior of
information in the web page, user still had to mine his
required information from the documents which were
retrieved by the search engine on the basis of keywords [7].
Due to which user get irrelevant results with low accuracy.
In order to retrieve complexinformation,userhastoprovide
separate queries and can manually merge the result. These

search engines cannot figure out the state of affairs in which
a word is being used.
Therefore, there is a need of intelligent search engine which
a semantic web provides. These search engines are called as
semantic search engines. Semantic search engine has the
capability to understand the meaning of user query and on
the basis of this meaning, they can retrieve the exact result
or document from the web. Semantic search engines are
based on context and concept of the searched phrase. They
provide more meaningful result by understanding and
evaluating the search query and finding the most relevant
data in web. The next two sections will describe about the
approaches used by semantic search engines and various
types of semantic search engines.
3.1 Approaches of semantic search engine
Ability to understand the content of the webpageisthemain
feature of semantic search. Semantic search enginesprovide
more accurate and meaningful content in result. Working of
each semantic search engine is different from another
semantic search engine. The main goal of semantic search
engine is to make data machine readable. It is needed to
ensure that the semantics are not missing during the
complete life cycle of information extraction [8]. In general
are four approaches for semantic search. Each of the
semantic search engines may use either one or more of the
given approaches.
First approach: A Contextual approachtodisambiguateand
to make the queries single meaning [4]. For example the
word “tear” refers to tear in eyes or rip or anything else.
Second approach: It mainly focuses on the reasoning. From
the given library of facts it can generate new reasoning.
Third approach: In this approach the mainfocusisgiven on
natural language understanding. With this approach the
search engines try to identify the semantic of the query
purposed by the user, by applying rules. Powerset makes
wide use of the natural language understanding [8].
Fourth approach: This approach uses ontology for
expansion of the query and knowledge representation. For
example when user fire a query for a term “apple” the
system add terms from its ontology (such as “fruit” because
an apple is a kind of fruit) to make the search more focused
as well as more accurate.
Semantic search engines can use combination of these
approaches in order to become more efficient in searching.
3.2 Semantic search engines
To access the data present on the web in a well defined way,
number of semantic search engines are introduced which
can understand and evaluate the semantic of the data and
can display the exact result as compared to the traditional
search engines. There are various types of semantic search
engines which are discussed here.
Swoogle
Swoogle was founded by Li Ding and Tim Finin. It was
designed to automatically discoversemanticwebdocuments
(SWD) on semantic web. It is a crawler based indexing and
retrieval search engine for RDF and OWL documents. It
mainly focuses on finding exact ontology and if it does not, it
creates new ontology based on ontology ranking algorithm.
Swoogle is also a content based search engine that analyses,
discovers, and indexes knowledge in the web [9]. But
swoogle has some limitations as it take a very long time for
query response and it also lack in indexing. The key goal in
building Swoogle is to design a system that will scale up to
handle millions and even tens of millions of documents [10].
Hakia
Hakia was launched in March 2004. It is used to search the
structured text. It does not use page popularity or keyboard
match concept to produce the search result,ratheritisbased
on the meaning of content. This search engine is specifically
designed to produce output on its understanding power of
web content. Hakia calls itself a “meaning based (semantic)
search engine [11].
DuckDuckGO
DuckDuckGo is a privacy concern search engine. Other
search engines track user’s search even if user is using
private browsing mode. But DuckDuckGo do nottrack user’s
search. It does not store IP addresses, does not log user
information and user cookies only when needed to maintain
the privacy of the user [9]. If mainly focus on retrieving data
from accurate and most relevant sources rather than
number of sources. DuckDuckGo represent relevant answer
of a query called instance answer, which is further called as
zeroclickinfo.
3.3 Challenges for semantic search engines
A. User interface: A friendly user interface is the first and
foremost feature of any search engine. There are so
many search engines like Google, Yahoo and Bing
provide a best end-user interfaces. Even if some search
engines do not provide best result for query response
but still end users remain to these search engines
because of their end user experience. Enhancements to
the end-user interface ofa semanticquerysearchengine
needs important development so that poor input
representation of a query will automatically suggest
corrections for spelling mistakes and poor grammar,
and of course find the best matched results with a high
accuracy[12].

B. Efficiency: The efficiency of a semantic search engine
depends upon its performance such as the request time
to web server and its associated response time. For an
efficient semantic search engine query execution time
must be as low as possible.
C. Scalability: Scalability is the abilityofa searchengineto
efficiently handle rapid growth in data. Scalability for
data in a semantic web presents additional challenges
because of the openness of the RDF protocol [13]. Many
of relational databases are very efficient, successful and
scalable due to their structure of relational data.
D. Cost Effectiveness: Provide a cost effective solution is
the main feature of a high qualitysearchengines. AsRDF
is open source, due to which processing queriesbecome
very expensive. Some efforts have been made to
introduce cost effective search algorithms such as the
SPARQL as search technique [14].
E. Page Rank: The main goal of semantic search is to
provide accurate and exact result in response to a user
query. For this purpose, various kinds of page ranking
algorithms are used for rating the web pages. There are
billions of web pages in www which makes it very
crucial for a search engine to sort and rank theretrieved
documents effectively.
4. CONCLUSION
This paper gives a brief overview of semantic web mining
and various semantic search engines. Semantic web is the
intelligent version of current web that help us to retrieve
meaningful data from the web. It is concluded that Semantic
search engines provide a unique experience foruseronweb.
But there are some challenges for semantic search engines.
Future work includes developingan efficient technologythat
can deal with the challenges and also is compatible with the
global standards of the web technology.
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