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Is anyone using nested file groups in their METS?
I just read the METS primer (again) and my eye was caught by something I didn’t remember from earlier readings:
A sequence of file group elements <fileGrp> can be used group the digital files comprising the content of a METS object either into a flat arrangement or, because each file group element can itself contain one or more file group elements, into a nested (hierarchical) arrangement. . . .
For a text resource with a variety of content file types one might group the content files at the highest level by type, and then use the <fileGrp> element’s nesting capabilities to subdivide a <fileGrp> by format within the type, such as:
• one <fileGrp> for all of the page images with nested <fileGrp> elements for each image for-mat/resolution (tiff, jpeg, gif)
• one <fileGrp> for a PDF version of all the pages of the document
• one <fileGrp> for a TEI encoded XML version of the entire document or each of its pages.
The nested file group option sounds great for situations such as the one described in my earlier post where we have a pdf of the entire work as well as page images. . . each top level fileGrp could correspond to a different physical struct map, allowing the user to pick among versions – epub, entire work pdf, page images version, etc.
Digital Collections Librarian
-- Rick Beaubien Technical Chair METS Editorial Board Contact information: 505-466-6630 88 Herrada Rd Santa Fe, NM 87508