SegName DISCARD

The segment name is allowed in the .spt file but will not output anything

SegName ONEONLY

The source lines are emitted only from the first .spt file processed, and are positioned according to the position of the segment in the build file

SegName ONCEINLINE

The source lines are emitted only from the first .spt file processed, and are positioned according to their position in the source (.spt) file

;<SegName>

Code down to the next segment is emitted subject to any qualifiers in the build file. Error if the segment name is not listed in the build file.

;<=IF SegName>

The rest of this line is emitted, in the same position as in the source file, only if the segment name is listed in the build file without a DISCARD qualifier. No error (or warning!) if not in the build file.

You cannot mix <=IF with ONEONLY or ONCEINLINE qualifiers. Behaviour is not guaranteed.