Define non-spatial phantom rendering, identifier uniqueness, and unsupported-reader behavior#76
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…pported-reader behavior Add a non-spatial and accessible rendering rule: a consumer that cannot render the spatial layer (a linear or reflow reader, a print or PDF export, a text extractor, or a screen reader) SHOULD surface phantom content by its cluster anchor in a stable order rather than silently dropping it, and SHOULD disclose an omission. Require cluster and phantom identifiers to be unique (within the file and within a cluster respectively), give a duplicate the same disposition as a broken connection target, and treat an ambiguous connection target as broken. State that a reader without phantoms support MUST ignore the phantom directory and manifest reference, that ignoring the out-of-hash layer is never an integrity error, and that a present phantom reference SHOULD also be declared in the extensions array.
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Summary
phantoms/directory and manifest reference (out-of-hash, so never an integrity error; higher data-file version is a WARNING); a presentmanifest.phantomsSHOULD also be declared inextensions[].Test plan
contentHashstaleness; inverted range) are already covered by phantoms §5.1 and core Anchors §7.3 respectively — verified, no change needed.