Top-level reading order #23
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…e attributes (but not @Custom); ensure readingorder idrefs are correct (also for dummy text and image region)
- `TextractLayout`: init with additional list
of top-level block dict stored in `child_regions`:
- just ID→dict (for LAYOUT_ types during build)
- or ID→block (for TextractTable, KEY, SELECTION etc.
already instantiated)
- add `parent_layout` reference
- `TextractTable`: add `parent_layout` reference
- `TextractKey`: add `parent_layout` reference
- `TextractValue`: add `parent_layout` reference
- build `layouts` after all other blocks are built
- replace recursive `child_regions` / `parent_layout`
after all `layouts` are built; remove recursive
instances from top level to avoid duplication
in ReadingOrder or PcGts instantiation
- ReadingOrder: extend recursive case (OrderedGroup)
of `LAYOUT_FIGURE` with `LINE` children to `LAYOUT_*`
with any `child_regions`
- instantiation of PcGts types for `layouts`
and `tables`: refactor as (inline) function
for recursion and
- try to re-use code
- add assertions around known types of recursion
(to be revisited with better documentation from AWS
or more data examples)
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