The IPTC items supported by AutoGallery are:
'2#047'=>'iptc_reference_date',
'2#050'=>'iptc_reference_number',
'2#055'=>'iptc_created_date',
'2#060'=>'iptc_created_time',
'2#062'=>'iptc_digital_creation_date',
'2#063'=>'iptc_digital_creation_time',
'2#065'=>'iptc_originating_program',
'2#070'=>'iptc_program_version',
'2#080'=>'iptc_byline',
'2#085'=>'iptc_byline_title',
'2#090'=>'iptc_city',
'2#092'=>'iptc_sublocation',
'2#095'=>'iptc_province_state',
'2#100'=>'iptc_country_code',
'2#101'=>'iptc_country',
'2#105'=>'iptc_headline',
'2#115'=>'iptc_source',
'2#116'=>'iptc_copyright',
'2#118'=>'iptc_contact',
'2#120'=>'iptc_caption',
'2#122'=>'iptc_caption_writer',
'2#150'=>'iptc_content_preview',
'2#200'=>'iptc_custom_field_01',
'2#201'=>'iptc_custom_field_02',
'2#202'=>'iptc_custom_field_03',
'2#203'=>'iptc_custom_field_04',
'2#204'=>'iptc_custom_field_05',
'2#205'=>'iptc_custom_field_06',
'2#206'=>'iptc_custom_field_07',
'2#207'=>'iptc_custom_field_08',
'2#208'=>'iptc_custom_field_09',
'2#209'=>'iptc_custom_field_10',
'2#210'=>'iptc_custom_field_11',
'2#211'=>'iptc_custom_field_12',
'2#212'=>'iptc_custom_field_13',
'2#213'=>'iptc_custom_field_14',
'2#214'=>'iptc_custom_field_15',
'2#215'=>'iptc_custom_field_16',
'2#216'=>'iptc_custom_field_17',
'2#217'=>'iptc_custom_field_18',
'2#218'=>'iptc_custom_field_19',
'2#219'=>'iptc_custom_field_20',
'2#230'=>'iptc_document_notes',
'2#231'=>'iptc_document_history',
'2#232'=>'iptc_exif_camera_info'
These will appear as placeholders in the processed chunk - so [+iptc_caption+] etc.