<?tporphp>

By applying a priority, content can be designated to be kept together as long as this doesn't result in an empty column or partial column. When this exception does occur, PTC ALD will attempt to break the page at the lowest priority it can find irrespective of the amount of resulting content that is carried over. Priority value ranges are explained below: note that PTC ALD can only ignore keep instructions with a priority below 210 if a whole column overflows, and can only ignore those below 110 if a partial column overflows, i.e. a column that has been cropped to avoid other frames, such as those containing images at the top of a column.

Priority	Usage
0	No keep applied (default value)
1 and 255	Absolute - always apply keep regardless of effect
2 - 109	Low priority, keep only if something fits in the column or partial column
110 - 209	Medium priority, keep unless this leaves a whole column empty
210 - 254	Reserved for future enhancements

The example below shows how to set the priority for widows and orphans so that it is always on, but without leaving any empty columns:

[no parameter]

Invoke the tporphp dialog box.

priority

An arbitrary figure may be applied here based on the guidelines given above. Note though that the tporphp dialog contains suggested values, which are explained here:

0	Off
100	On: But do not leave empty partial columns
200	On: But do not leave empty whole columns.
255 (or 1)	On: Always: the current paragraph is kept with the next paragraph at all times.

The priority values of 100 and 200 entered by the dialog correspond roughly to the 109 and 209 thresholds respectively: this is to allow some leeway in specifying slightly higher priorities manually, that still have the same effect.