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\label{sec:introduction}  \section{Introduction}   The Virtual Observatory (VO) provides a set of standards and protocols that enable interoperability among astronomy-centered services and applications \cite{}. \cite{NEED VO CITATION}.  %Building VO-enabled, interoperable applications poses several challenges to software developers.  In order to design effective applications, one wants to leverage VO standards and protocols without exposing the complexity and technicality of their specifications to the users. Also, while application developers implement many desired functionalities, they must keep the door open for plugging in user's analysis code, and allow third party developers to extend the application's functionality without being aware of the standards themselves.