- If an XrefTable has an associated stream, as indicated via the XrefStm-property, then read and add that XrefStream
- Any table can have 0 or 1 such associated streams
- A caveat: such an associated stream might also theoretically be part of the Parts-sequence in which case it would be encountered both by looping through all those parts along with all the regular tables and now also by association to any of those tables. It doesn't seem harmful since the offsets are flattened eventually anyway and stored by their offset-key into a mapping-table.
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