[jira] [Created] (TIKA-2458) Unify number of pages metadata key

["Tim Allison (JIRA)" <ji...@apache.org>]

Tim Allison created TIKA-2458:
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             Summary: Unify number of pages metadata key
                 Key: TIKA-2458
                 URL: https://issues.apache.org/jira/browse/TIKA-2458
             Project: Tika
          Issue Type: Improvement
          Components: core
            Reporter: Tim Allison
            Priority: Minor


On TIKA-2451, we're adding a metadata value for the number of images in a tiff.  This raises the broader (admittedly minor) question of how we want to handle "number of pages".

I'm opening this issue for discussion and feedback.

Unfortunately Dublin Core doesn't have a {{number of pages}} element as far as a I can tell.

Do we want to have a single key in {{TikaCoreProperties}} that is "number of pages" that would be used for: 
# number of pages in a PDF
# number of pages that a .docx alleges it has
# the number of slides in a PPT
# the number of sheets in an XLS
# the number of tiffs in a multi-image tiff

Others?

Or, do we want to have different keys {{MSOffice.PageCount}}, {{PagedText.N_PAGES}}, {{TIFF.NUM_TIFFS}}

Or, thanks to the beauty of composite keys, do we want to have both a unified key and the above individual keys?

*I would propose using PagedText's {{N_PAGES}} as the unifying key, but the definition of that seems to be strictly within XMP-land _and_ it should be a sum of the pages in the container document and all embedded documents according to our javadocs.



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