} else if (version.versionChangesSince()) {
iterator = new ChangesSinceContentIterator(_content, ((RequestParameterVersionChanges)version).versionNumber());
} else if (version.versionCurrent()) {
iterator = new CurrentContentIterator(_content);
} else if (version.versionSingle()) {
iterator = new VersionContentIterator(_content, ((RequestParameterVersionSingle)version).versionNumber());
}
if (iterator != null) {
this.listContent(_request.wri().databaseIdentifier(), iterator, _request, body);
}