Lists all BTR tag identifiers.
Values:
| IGMDTAG_ID_BTR_FORMAT | BTR metadata format identifier. |
| IGMDTAG_ID_BTR_MANUFACTURER | Manufacturer value. |
| IGMDTAG_ID_BTR_VERSION | Version value. |
| IGMDTAG_ID_BTR_IMAGETYPE | Image type. |
| IGMDTAG_ID_BTR_HORZRES | Horizontal resolution. |
| IGMDTAG_ID_BTR_VERTRES | Vertical resolution. |
| IGMDTAG_ID_BTR_BITSPERPIXEL | Bits per pixel. |
| IGMDTAG_ID_BTR_PIXELSPERLINE | Pixels per line. |
| IGMDTAG_ID_BTR_STORAGEFMT | Storage format. |
| IGMDTAG_ID_BTR_TRANSFMT | Trans format. |
| IGMDTAG_ID_BTR_PREVPAGE | Previous page. |
| IGMDTAG_ID_BTR_NEXTPAGE | Next page. |
| IGMDTAG_ID_BTR_NUMLINES | Number of lines. |