DOCUMENT_UNITΒΆ
| DOCUMENT_UNIT_UNDEF | Undefined. |
| DOCUMENT_UNIT_KM | Kilometer. |
| DOCUMENT_UNIT_M | Meter. |
| DOCUMENT_UNIT_CM | Centimeter. |
| DOCUMENT_UNIT_MM | Millimeter. |
| DOCUMENT_UNIT_MICRO | Micrometer. |
| DOCUMENT_UNIT_MILE | Mile. |
| DOCUMENT_UNIT_YARD | Yard. |
| DOCUMENT_UNIT_FOOT | Foot. |
| DOCUMENT_UNIT_INCH | Inch. |