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addEvidence( $evcode, $src, $author [, $date] )

 Title:    addEvidence
 Usage:    $evidenceTag = $entry->Stars->EV->addEvidence($evcode, 
                                                         $src, 
                                                         $author 
                                                         [, $date])
 Function: adds the evidence to the EV block if it does not yet exist 
           or returns the correct evidence tag if the evidence already exists, 
           possibly with a different date.
 Args:    $evcode: the evidence code. e.g. ECO:0000269
          $src:    the source. e.g. PubMed:11433298 
          $author: the author (initials). e.g. XXX p.s. For programs this could be '-'.
          $date: optional. If present, it must be in standard SWISS-PROT 
                 date format. If not present the current date will be used.
 Returns: The correct evidence tag.

updateEvidence( $evcode, $src, $author [, $date] )

 Title:    updateEvidence
 Usage:    $evidenceTag = $entry->Stars->EV->updateEvidence($evcode, 
                                                            $src, 
                                                            $author 
                                                            [, $date])
 Function: updates the evidence to the EV block to $date or inserts it 
           if it does not yet exist.
 Args:    $evcode: the evidence code. e.g. ECO:0000269
          $src:    the source. e.g. PubMed:11433298 
          $author: the author (initials). e.g. XXX p.s. For programs this could be '-'.
          $date: optional. If present, it must be in standard SWISS-PROT 
                 date format. If not present the current date will be used.
 Returns: The correct evidence tag.