MARKER lines may be used in the COLUMNS section. They contain three fields.

• The content of field 1 is ignored.
• Field 2 must contain the string "'MARKER'", and
• field 3 contains either the string "'INTORG'", "'INTEND'", "'SOSORG'", or "'SOSEND'".

The QSopt document reader parses "'SOSORG'"/ "'SOSEND'" MARKER lines but does not interprete the input otherwise, see MPS format SOS MARKER lines.

"'INTORG'"/ "'INTEND'" MARKER lines are discuused in MPS format integer variables .

See also MPS format data lines, MPS format integer variables, MMPS format SOS marker lines, MPS format definition, and File formats.