Example use case: Store metadata about the PDF outline (i.e., table of contents sidebar) that doesn't fit perfectly into any of the existing annotation types (BoxGroup or SpanGroup). A PDF outline object is essentially a tuple of (text, location-pointer, nesting-level).
Idea discussed briefly with @kyleclo so this may need refinement.
Example use case: Store metadata about the PDF outline (i.e., table of contents sidebar) that doesn't fit perfectly into any of the existing annotation types (BoxGroup or SpanGroup). A PDF outline object is essentially a tuple of (text, location-pointer, nesting-level).
Idea discussed briefly with @kyleclo so this may need refinement.