Many tags (e.g. row, margin) require you to enter some numeric measure (e.g. margins dimensions, how many row to skip,...). These values have different unit system depending on which pagemanager you choose.
When you say:
<column leftpos='5' Width='20' align='center' /> |
the width='20' has different meaning depending on the pagemanager.
Again, the following code:
<row VPos='Relative' RowPos='+2'> |
it means: