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A Designer form whose table (a top-to-bottom subform inside an area of a positioned page) asks for several rows with `<occur min="10"/>` was laid out with one row, and a FormCalc total looping over the rows stayed empty. - layout: a repeating subform inside a top-to-bottom container in positioned content is drawn and measured once per instance (occur and data), with its own SOM index, as flowed content already was. One `instances` helper now serves flowing, table rows and this case. - data: areas are named in SOM expressions but are not data scopes. `data_path(tpl, som)` leaves them out (unknown segments are kept), and layout, the script tree, reading and writing the datasets and the engine's value and row operations use it. Before, values Adobe's viewers saved were not read, what was filled here went under a new element named after the area (which Adobe's viewers would most likely not read), and scripts counted the rows there: one, so a loop over the table's rows failed on the missing ones. - write_datasets_with / read_values_with take the parsed template when the caller has it (the engine's cached one); the old functions parse the document's. - Tests: layout regression, data_path rules, and an engine round trip shaped like such a form (rows, Adobe-written values, a FormCalc total over every row, the data written back, reopening). Signed-off-by: Hadi Chokr <hadichokr@icloud.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>