if ( this.keyphrases != null )
for( KeyphraseImpl keyphrase : this.keyphrases )
issues.addAllIssues( keyphrase.getIssues());
if ( this.creators != null )
for( ContributorImpl creator : this.creators )
issues.addAllIssues( creator.getIssues());
if ( this.contributors != null )
for( ContributorImpl contributor : this.contributors )
issues.addAllIssues( contributor.getIssues());
if ( this.publishers != null )
for( ContributorImpl publisher : this.publishers )