The ptree_get_next_by_row() function copies the handle of the property that is in the next column of the table and on the same row as the property proph. The handle is copied into the location given by rowh.
The ptree_get_next_by_col() function copies the handle of the property that is in the next row of the table and on the same column as the property proph. The handle is copied into the location given by colh.
If there are no more rows or columns, this function returns the value PICL_ENDOFLIST.
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