<?tpprev>
Description
Forces the first line of the paragraph to which it is applied to stay in the same column as the previous paragraph. For example, if the previous paragraph starts in another frame or column, the first line of the current paragraph would be moved to stay with it.
This keep PI is usually applied with a priority parameter - 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.
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Priority
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Usage
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0
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No keep applied (default value)
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1 and 255
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Absolute - always apply keep regardless of effect
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2 - 109
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Low priority, keep only if something fits in the column or partial column
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110 - 209
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Medium priority, keep unless this leaves a whole column empty
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210 - 254
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Reserved for future enhancements
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Syntax
<?tpprev priority:n?>
<?tpprev>
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[no parameter]
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Invoke the Keep para with end of prev dialog box.
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priority
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An arbitrary figure may be applied here based on the guidelines given above. Note though that the Keep para with end of prev dialog contains suggested values, which are explained here:
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0
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Off
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100
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On: But do not leave empty partial columns
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200
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On: But do not leave empty whole columns.
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255 (or 1)
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On: Always: the current paragraph is kept with the next paragraph at all times.
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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.
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Additional information
Keep commands work to slightly different rules when included in a cell in a table, since each cell can be seen as a "mini column" which forms parts of a hierarchy where each cell is a column in itself, each row can contain multiple cells, etc. This <?tpprev> command is superceded by the table's row keeps and hence will be ignored if it is placed at the start of a cell , i.e. the content of the cell will not keep with content in the previous cell.