'sha1' => isset( $row->ar_sha1 ) ? $row->ar_sha1 : null,
'content_model' => isset( $row->ar_content_model ) ? $row->ar_content_model : null,
'content_format' => isset( $row->ar_content_format ) ? $row->ar_content_format : null,
'sha1' => isset( $row->ar_sha1 ) ? $row->ar_sha1 : null,
'content_model' => isset( $row->ar_content_model ) ? $row->ar_content_model : null,
'content_format' => isset( $row->ar_content_format ) ? $row->ar_content_format : null,