Bulk metadata update

[M-Nicholls]

Need to be able to run batch updates to image metadata particularly licenses:

e.g. set license for all or a subset of images from a data resource

• the set default image license in the collectory seems to be over riding the information provided in a Darwin Core archive and it doesn't have an option to set the default back to empty.

Specific example is dr660 (ANFC images) - I'm trying to update the licensing for a subset of the images to "All rights reserved" but the images still have CC-BY_NC on them, see dr660 metadata for file and current settings.

[djtfmartin]

Theres a mechanism in place already to retrieve resource level metadata from the collectory and display on image pages. See "Image metadata" section of data resource pages.

This works by retrieving and caching the image metadata from the collectory, but will fall back to image level info when available.