Most of early annotation tools, such as iAnnotate \cite{plimmer2010}, uAnnotate \cite{chatti2006}, A.nnotate\footnote{http://www.a.nnotate.com/}, GroupDocs.Annotation\footnote{http://www.groupdocs.com/apps/annotation/}, Diigo\footnote{https://www.diigo.com/}, etc., incorporates different options useful to invite readers to physically interact with their reading materials through marking passages by highlighting, underlining, crossing out words, adding comments and so much other annotations acts \cite{kalboussi2015}.
Even though these tools are efficient, but they focus on the annotation process without interest to take advantage of the implicit meanings of
Even though these tools are efficient, but they focus on the annotation process without interest to take advantage of the implicit meanings of