/**
* \brief Get the dictionary entry identified by a given tag (group,element)
* @param group group of the entry to be found
* @param elem element of the entry to be found
* @return the corresponding dictionary entry when existing, NULL otherwise
*/
/**
* \brief Get the dictionary entry identified by a given tag (group,element)
* @param group group of the entry to be found
* @param elem element of the entry to be found
* @return the corresponding dictionary entry when existing, NULL otherwise
*/