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Step parameters can name where they act through tokens that are worked
out when the step runs, so a macro made on one block of data works on
another: a declared input (Input, or any other input's name), Output
(the output rule's anchor), Row or Column (the current item of the
Repeat step around the step) and Name:Total (a defined name or a
table's data). Methods narrow or move the range: col(n) or
col("Header"), row(n), cols(a..b), rows(2..), cell(r,c) relative to the
top-left cell, offset(r,c), resize(h,w), data (without the header row),
below(n) and right(n). Methods chain.
A token is written as {"$ref": "..."} anywhere, as the whole string of
a reference parameter (cell, range, target, keys ending in Cell or Range
and similar), or as {{...}} inside any string, which is how a formula
refers to its input. Other text parameters are never read as tokens, so
a cell can still hold the word Row and a chart can still be of type
column.
Every token becomes A1 text, sheet-qualified when it is on another
sheet, before the command runs, so no existing command changes. Plain A1
references in a step stay absolute. A reference that runs past the edge
of the sheet is reported apart from other mistakes, so the footprint
check can tell the two apart.