| \subsection{Model Merging Task} | |
| The \emph{epsilon.eml} task executes an EML module, defined using the \emph{src} attribute on the models that are specified using the \emph{model} nested elements. In addition to the attributes defined by the ExecutableModuleTask, this task also provides the following attributes: | |
| \begin{itemize} | |
| \item \emph{useMatchTrace} : As discussed in \ref{sec:EML}, to merge a set of models, an EML module needs an established match-trace between elements of the models. The \emph{useMatchTrace} attribute enables the EML task to use a match-trace exported by a preceeding ECL task (using its \emph{exportMatchTrace} attribute). | |
| \item \emph{exportMergeTrace, exportTransformationTrace} : Similarly to ETL, through these attributes an EML task can export the internal traces calculated during merging for subsequent tasks to use. | |
| \end{itemize} |