Therefore, the Semantic Web allows the current KM systems
to resolve the problem of knowledge/information overload and duplication.
There are three types of integration: (1) data integration, (2) application integration,
and (3) process integration (Giachetti, 2004). The goal of data integration is
data sharing where different systems exchange data with each other. The goal of
application level is to achieve interoperability between systems. The obstacles of
integration arise at syntactic and semantic heterogeneity between different information
systems or applications (Giachetti, 2004; Noy, Doan, & Halevy, 2005). Until
recently, the approaches to provide interoperability include standardization and
middleware or mediators as well as enterprise application integration (EAI). The
enterprise knowledge portal (EKP) is a system integrating various tools for KM in
the perspective of users. Although the traditional integration approaches such as
middleware and standardization easily integrate the structured data extracted from
heterogeneous databases, they have limitations when integrating the unstructured
data or knowledge from the various knowledge sources such as HTML, word processor
files, and spreadsheet files.
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