| TYPE | NAME | DESCRIPTION |
|---|---|---|
| STRING | procedure_name | The name of the procedure to be used for loading |
| STRING | extensions | comma separated list of extensions this handler can load (i.e. "jpg,jpeg") |
| STRING | prefixes | comma separated list of prefixes this handler can load (i.e. "http:,ftp:") |
| STRING | magics | comma separated list of magic file information this handler can load (i.e. "0,string,GIF") |