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p:custDataLst points at ppt/tags/tagN.xml parts that add-ins such as think-cell, Mekko Graphics and Office Timeline use to recognise their decks, slides and shapes. They were dropped on open, so a saved deck lost its add-in identity. The model now carries name/value tags on the presentation, slides and shapes; the reader resolves every tags part and the writer emits one tags part per holder, in the schema's element order. Co-authored-by: Cursor <cursoragent@cursor.com>